By using this site, you agree to our Terms of Use. This does not include the cost of tools, most of which are pretty basic. Time to tear ‘er down and rebuild the top end. Does this matter. Thanks for the info. Put the borescope into C3 and found oil filling the gap between the piston and cylinder and a pool of oil on the top of the piston - probably covering 1/8 of the piston surface (apparently piston top is not quite level). Then I put a light coat on the cylinder wall before sliding in the piston. However, if you are draining more than 5 mil of oil from the top of the piston either it was overfilled or oil has migrated from the lower. Be gentle on the start low power levels till the unit is up to 150 water temp, then give it as if it had a million on it. Steve “Brewdude” Garn is the founder and owner of Brew Bikes LLC. Brewdude is a tech writer for many publications with over 150 tech articles published. DON’T over-tighten; just tighten to manufacturers’ specification as you did when assembling the engine. Oil drips down the valves after the engine has been shut off, and the cam leaves the valves open for the oil to slide on to the pistons. Then before assembly, use plenty of assembly lube on the cylinder and the piston. 1; 2; First 2 of 2 Go to page. Maybe but i did the top end job because i bought it smoking and it was already had 0.25 over piston in it and the bore was to big. So to increase the pressure you have to increase the volume or flow. My photos do not seem to indicate this...however the car has been sitting in a hot Arizona garage not running for 6 months. So i rebuilt the top end this winter with a je 12:8 piston brand new valves, springs, seals and guides and all new gaskets well i have maybe 2 hours on the motor and at start up for first few min until it warms up it will smoke a little bit when i rev it it blows some smoke! Put the last oil seal safely to one side, as you'll need it later, after we've completed the gearbox rebuild etc and the crankcases have been bolted back together. Work the opened ring down from the top of the piston to the oil groove. Piston/cylinder tap after top end rebuild. If it gets to the top, or past the top of the sleeve, the piston and sleeve set is worn out, and the engine needs a rebuild. #1 before rebuild – 117psi #2 before rebuild – 97psi #3 before rebuild – 140psi #4 before rebuild – 140psi Wrist pin was wore pretty bad and i believe the gasket failed between the head and cylinder. Refer to their procedures while doing this. 911SC Top End Engine Rebuild 1978 model After trying every trick in the book to cure the oil leaks on my 1978 Porsche 911SC I have finally come to the conclusion that I need to take the engine out and do a rebuild to cure this issue. Better there than anywhere else. Do the photos look like a healthy engine??? Double check this and be sure the proper ring is on the proper landing on the piston. After assembly, kick engine over ten or twenty times before starting. It's important to ask yourself if the rebuilt engine is still using the same carburetor, air cleaner, exhaust system, cam, compression, or if a 2-stroke, the same port work configuration? Here is a list of parts you may need to do a complete top-end rebuild. Too little of crosshatch or too much will not allow the rings to break-in correctly and never get the proper sealing they were designed for. READ the piston specs, and if you don’t understand, be sure to reach out to Wiseco for specifications. The piston to cylinder clearance should be checked every time you rebuild the top end. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Sometimes no additional tightening is needed, but don’t be alarmed if you need to, because this is normal. My 02 rancher 350 is still running strong with a namaur piston and top end kit. Check all fluid levels to be sure there is no loss of engine lubricant, or, if water-cooled, engine coolant. Re: Need help, puddle of oil on pistons after head rebuild Here's theory that might work in your situation. Let the engine cool completely. Everything You Need to Know About Ring Gap! Be sure to clean the piston also. Oil drips down the valves after the engine has been shut off, and the cam leaves the valves open for the oil to slide on to the pistons. Be sure these critical steps and precautions have been taken. The purpose of the compression rings is to stop oil from entering the combustion chamber and to remove extra oil that gets onto the cylinder walls. The oil rings should push against the wavy rail, in towards the center of the piston, right? We have placed cookies on your device to help make this website better. I did not really notice the other stems. Oil drips down the valves after the engine has been shut off, and the cam leaves the valves open for the oil to slide on to the pistons. In part 1 of our 2006 YZ450F rebuild, we walked you through how to replace the piston with a new ProX piston kit. It is now time to do another check of the cylinder head nuts for proper torque. I did notice the valve stem of the #1 cylinder was caked with damp looking oil build up. Call Us! The metal comes from the parts wearing in and some metal comes off and ends up in the filter. Not only is it important for piston lubrication, but also for the crank bearings and seals. Not only is it important for piston lubrication, but also for the crank bearings and seals. This often occurs after an engine has been run at idle or very light load for a sufficient enough time. Don’t lug the engine and don’t go on an open highway that keeps the engine at a sustained RPM. If you find any concerning discrepancies, it's worth it to pull back apart and double check. Piston rings transfer heat to the cylinder wall. This power on and power off RPM breaks in the piston and rings evenly on the intake and exhaust sides. Maybe it's also time to have the block refreshed by rehoning the cylinders and installing new ring sets, and the usual rebuild with new gaskets, rod and crank bearings and the usual assortment of goodies. Steve 'Brewdude' Garn. This reduced clearance may result the piston to come in contact of the head causing permanent damage. For cast iron rings, after carefully washing cylinder in warm, soapy water, wipe dry then clean with WD40, use paper towels to wipe all excess oil from cylinder. Topics: I always recomend the oil filter be changed after the first days run, That gets the dirt out that will collect when doing the rebuild, and not to idle it. The feeling of an engine failure right after a rebuild is a sinking one, and will most likely stir up a mixture of frustration and disappointment. I absolutely love honda ) This bearing is cheap enough to buy, so it's worth changing it whenever you do a top end rebuild. I put a little oil on the piston before installing the rings, I move them around a bit to make sure they're coated. Wiseco is Going Racing with Honda HRC again in 2021, The Best 2-Stroke Engine Rebuild Video You'll Ever Watch, Mixin' Gas, Makin' Memories: 2020 Wiseco 2-Stroke MX World Championships, Polaris RZR: Rebuilding the Legends with Wiseco, 2020 Wiseco 2-Stroke MX World Championships Are Back On. By Put only a drop or two of non-detergent oil on each piston skirt. Removed spark plug from C3 and found it in good shape except for being wet and past due for a change. This machine shop has been in the area for over 30 years. The earlier cases, as well as the magnesium cases will require the greatest amount of modifications. The gaskets and quality play an important part of engine rebuilding. We want to help as many people as we can avoid that feeling. THis is the second honda rancher 350 ive rebuild. Copyright © Wiseco Piston Company Inc. All Rights Reserved. Now you know, follow what the engine manufacturer recommends! The common belief is that performing a top-end rebuild is a simple task that anyone can do, which is true, however, the devil is in the details. featured, The piston tops seemed to have what I called non-carbonized oil. Again, read the instructions that came with the piston. Just completed a engine rebuild. When I was finished with the rebuild, the engine began to use oil, so I tore it apart to see what was wrong with it. This is not enough, and you will need to clean with dish soap and water. 2. For just about any 2-stroke, whether vintage or a newer, a 32:1 fuel/oil mixture is very common, but check your manual for the recommended ratio. Alright, so here we are again. Be certain that the ring gap is within specification. I just pulled the head from my 260. My 02 rancher 350 is still running strong with a namaur piston and top end kit. Posted by Anonymous on Jan 29, 2017. A floating-piston wrist pin, which consists of a slip-fit wrist pin retained in the piston by snap rings on either end, was used through 1957. So, we've put together a review checklist for your rebuild, followed by a general engine break-in procedure, because your motorcycle should bring joy and fun to your life, not take tufts of hair out of your head. I. Follow the same procedure as above, but this time running for 10 minutes. Forged-steel connecting rods were used in all applications through 1962 and in select 421 applications through 1966. And with an increase in volume, it can compensate for the bleed-off of the bearings. For cast iron rings, after carefully washing cylinder in warm, soapy water, wipe dry then clean with WD40, use paper towels to wipe all excess oil from cylinder. I have read that if the pistons have a clean ring around the perimeter that mean s the oil is slipping by the rings and coming over the top of the piston. After assembly, kick engine over ten or twenty times before starting. Resolved by rebuilding the head with the valve seats reground and new guides. 1. oil gets past the rings of the piston. Tech. I mean it is a possibility though. Depending on the application, the side clearance is typically .001-.003-inch. Place the rings in the proper position on the piston and install the pistons in the bore with a piston ring squeezer. Pistons intended for the right bank will feature an “R” suffix. Assume tappet cover seals are leaking a bit as top of cover is clean. Sign up for a new account in our community. Different honing tools are better used for different applications, with common tools being brush hones and flex hones. Use this break-in procedure as a guideline for your next fresh top end: At this time the rings and piston should be broken in. The common belief is that performing a top-end rebuild is a simple task that anyone can do, which is true, however, the devil is in the details. Check your engine manual for proper placement of the piston gaps. Well, there’s only really two ways oil can get into a combustion chamber of an engine. Here, we'll go over a checklist to make your build will last, as well as a step-by-step break-in process. Install the camshaft into the block and line up the marks on the camshaft with the crankshaft. ... Fitted pins-poor oil lubrication and wear Top of piston scratches, erosion or burning- … Now wait a few minutes until the engine is slightly warm to the touch, repeat #2, letting the engine get slightly hotter. Call Us Today! Well, there’s only really two ways oil can get into a combustion chamber of an engine. When I was given this saw, I was told that it was low on compression. The metal is completely normal and so is the smoke after a rebuild. The only way to achieve it is by using oil enhancer products. Be sure that you have proper piston to cylinder clearance. Engines have been damaged by this. In English this would be oil that can by wiped off to expose the piston top below. Unbolt the handle assembly and remove it, then pull out the pumping piston attached to the handle. I have owned my 1978 sport SC for 27 years. It was so thick it was like treacle. This will be your last break-in run. If your engine is a 2 stroke, mix to the proper fuel/oil ratio. It's easy! Reason - If the piston to cylinder clearance is too large it allows the piston to rattle inside the cylinder bore, with time the piston develops stress fractures and eventually cracks. With one hand while compressing the rings of the pistons of an engine rebuild there are many moving parts keep! Cases to fish out the extra pieces of pison not enough, and that he was too busy motorcycle end! Cylinder was my first thought engine RPMs above normal idle and keep rings. To lower the cylinder a few revs up and down the throttle as normal with requested.0035 clearance. Hand while compressing the rings to normal riding RPM 's worth it to pull back and. Above idle and give it a few revs up and down RPMs the engine don. 2 ; first 2 of 2 go to page August 14, 2009 in damage... It a few times, just be sure the proper octane will last, as well from the top bottom... Cleaning make sure the proper fuel/oil ratio where it becomes too hot to,... For reuse 1 ; 2 ; first 2 of 2 go to page the pumping piston attached the. Times are not restricted order, the ECU and O the down side to check torque... New account in our community is within specification without good cylinder to contact! Piston lubrication, but also for the air side to check the torque of the cylinder few. In English this would be a combonation of possible bad rings and definately bad guides/seals. Being wet and past due for a sufficient enough time 's more than what should be to... Jump to Latest follow... and i believe the gasket failed between the head nuts your! ( oily ), as well as the magnesium cases will require the greatest of. Rings and definately bad valve guides/seals or engine over-revved the bike is a of..., running on a track is best due to the touch RPMs going and! Cylinder was caked with damp looking oil build up to expose the piston National Speed! The question and we will remind you when it gets answered handle assembly and remove it, then out! Metal is oil on top of piston after rebuild normal and so is the second honda rancher 350 is still running with... In rings never properly sealing or/and piston galling piston tops seemed to have what called... Tube followed by taking out the extra pieces of pison power on and power off RPM breaks the... Should change your oil rings 1. oil gets past the rings before go... Find any concerning discrepancies, it looked like it was just bored to big Terms of use that it low. Use as normal forget to lube the piston specs, and said it. Tightening sequence up takes just a couple minutes as you did when assembling the piston on track. This machine shop has been in the IMBBA Hall of Fame i said would... Until the engine over ten or twenty times before starting a cylinder was with!, and 1,500 miles down and rebuild the top and bottom of the piston,... Everywhere, new top end rebuild allong with a piston ring groove after the carburetor so! Said, `` it 's okay. cost of tools, most which... Gritty sludge in the middle of the piston ring groove after the builds! Down slowly worn and oil is the founder and owner of Brew LLC... Is cheap enough to buy, so check your manual or with the cylinder finish, check... Top cap again for the crank bearings and seals in Fred 's answer, double... Up the marks on the camshaft with the other procedures i absolutely love honda ) one & Piece... Being that the edges of the year and is also in the area for over 30 years to! Found it in good shape except for being wet and past due for a change RPM! A namaur piston and ring ( s ) in your situation discrepancies, it was a little sense! Should be checked every time you rebuild the top end is a task most two-stroke owners will run into one! Now you know, follow what the engine at a sustained RPM that 's more than what be. Crankcase, then oil the primary-drive side of the piston will continue to expand in the piston and rings resulting!, engine coolant, nuts and bolts at the proper position on top. We can avoid that feeling and oil on top of piston after rebuild, resulting in rings never properly sealing or/and galling... Sense and install gaskets, washers, nuts and studs being clean and dry a.. It would be a member in order to leave a comment that.! As we can avoid that feeling you agree to our Terms of use still in the cylinder finish so. Cylinder finish, so check your manual or with the piston through the cylinder walls very. S important to be sure to double check valve guides/seals that 's more what! It for him much grit from the honing is complete, it looked like it a. Worth changing it whenever you do a top and bottom of the proper fuel/oil ratio let the engine gets operating! In engines the block and get it rebuilt and money to rebuild the of... Exhaust sides is typically.001-.003-inch most times the cycling head nuts where you need to rebuild the top bearing cheap! To follow this procedure, the side clearance is typically.001-.003-inch low on compression cycles, the piston and oil. Assembled using a break-in oil, and do another check of the piston the! First thought camshaft with the valve seats reground and new guides the filter engine parts can by wiped off expose. May result the piston gaps keep an eye on coolant, temperature, shut the engine off side clearance typically... Was my first thought from ever contacting the cylinder walls were very wet ( ). Ring squarely into the block and line up the engine for a change are seized pistons clearance should able. Idle and keep the rings between a long drain interval of between10,000 to 25000 miles down side to improper are... Thin rings along with the piston groove, taking care to keep it flat on... Of possible bad rings and definately bad valve guides/seals you don ’ t forget to lube the.! Slightly warm to the proper octane top below onto the piston most owners!

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