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Top End Install for GY6 Part B NOTE: Not all steps are included. You need to be a member in order to leave a comment. Cause - Piston to cylinder clearance too large or engine over-revved. After the cylinder is clean, apply oil to it, the piston and the rings before assembly. Most piston rings have a top and bottom surface, so it’s important to install them as intended. Hense the wet look piston tops. Putting in the time and money to rebuild your motorcycle engine is both a critical job and a prideful accomplishment. After a short time of service the smoke came back it was then tore back down and new rings were once again installed along with a brand new oem head ,valves,springs,keepers,guides and seals after three hours of service the smoke is back along with oil consumption. After placing the gaskets, be sure while assembling the piston in the cylinder that the ring gaps are in proper placement. I did notice the valve stem of the #1 cylinder was caked with damp looking oil build up. 1. oil gets past the rings of the piston. Step-1: Install Camshaft. Here, we'll go over a checklist to make your build will last, as well as a step-by-step break-in process. P.S. And with an increase in volume, it can compensate for the bleed-off of the bearings. 1. oil gets past the rings of the piston. Modern piston seals are made of synthetic material and do not "soak up" the oil the way older leather seals had to in order to remain pliable. After the new piston is installed and the cylinder is torqued down, you're left with the next major task of a four-stroke top end rebuild: the head rebuild. This does not include the cost of tools, most of which are pretty basic. We have placed cookies on your device to help make this website better. If you fail to follow this procedure, the piston rings may never seat. The fuel you use should be fresh and of the proper octane. Go out and ride it. Finally, lubricate the oil seal in the right-hand side of the crankcase, then oil the primary-drive side of the crankshaft spindle. The cylinder wasn't really scared or anything it was just bored to big. Most companies give the head nut torque rating with the washers, nuts and studs being clean and dry. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. But that's more than what should be there. Resolved by rebuilding the head with the valve seats reground and new guides. Let it cool again till it is slightly warm to the touch. 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. Do I need to bore my cylinder? Results for cold and dry are listed below. The underside of this piston features an “L” suffix, indicating that this piston is intended for the left bank of a V engine. You should be able to lower the cylinder with one hand while compressing the rings with the other. Yes, way too tight. The oil rings should push against the wavy rail, in towards the center of the piston, right? Resolved by rebuilding the head with the valve seats reground and new guides. The piston will now lift off, and you will see a needle roller bearing (the small end bearing) that you can remove from the con rod. Not only is it important for piston lubrication, but also for the crank bearings and seals. It should go in most of the way and stop. This is the first oil change since the rebuild. Let the engine cool till you can touch the engine. Help. The gaskets and quality play an important part of engine rebuilding. Read on to see the most common mistakes that you should avoid. 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. If it has a bridge in the exhaust port, most pistons require this area to be relieved. Why is there oil getting on to my piston after top end rebuild it only run for 6 miles the cut out got it home and oil is getting on the piston. Use the proper engine oil and fill to the proper level. After your post I removed the blue top cap again for the air side to check the fluid and it is definitely green. We want to help as many people as we can avoid that feeling. Steve 'Brewdude' Garn. With today’s thin rings, some racers run side axial clearance as tight as 0.0004 - 0.0005-inch, using gas ports to supplement ring pressure. When I was given this saw, I was told that it was low on compression. Change Oil Often. The earlier cases can modified to later specifications by adding piston squirters for better lubrication, boat-tailing the main bearing ribs for better oil circulation, and align boring the intermediate shaft to accept the later bearing shells. Remove the oil reservoir plug from the jack and drain the oil into a pan. Periodically, if you own a two-stroke, there will come a point where you need to rebuild the top end of your engine. Ride the bike, revving the engine up to normal riding RPM. We'll start with a quick review on the motorcycle top end rebuild. Resolved by rebuilding the head with the valve seats reground and new guides. Rebuilding a top end is a task most two-stroke owners will run into at one point or another. When doing an engine rebuild there are many moving parts to keep in mind. He has 2 #1 AMA National Land Speed records and 3 #1 AMA plates in 2017. After first start up I noticed some blue smoke when blipping the throttle. If the oil is not changed at proper intervals, or proper care is not taken of the oil filter, the oil will accumulate debris that causes the oil passages in the piston rings and pistons to clog. Blowing oil smelling smoke after rebuild. By Re: Need help, puddle of oil on pistons after head rebuild Here's theory that might work in your situation. If your engine is a 2 stroke, mix to the proper fuel/oil ratio. Now wait a few minutes until the engine is slightly warm to the touch, repeat #2, letting the engine get slightly hotter. Thanks for the info. It never hurts to do another spark plug reading and double-check the head nuts after your first long ride. Most times the cycling head nuts will need some re-tightening. Assume tappet cover seals are leaking a bit as top of cover is clean. Install the camshaft into the block and line up the marks on the camshaft with the crankshaft. After engine is cool, do a plug reading to be sure it is not running lean. Increasing engine oil makes the sludge harder to form. Don’t be afraid to run it normally. Adding some oil to #2 cylinder did not change the readings all that much, which indicates that the piston rings are sealing properly. First, use a cleaning solvent with a brush and then again with a rag. Now is the time to let the engine totally cool down again. After a rebuild and gentlemanly low-rpm running tests of my MK1 I am a bit perturbed about oily plugs and pools of oil that form on the tops of the dished pistons. Forged-steel connecting rods were used in all applications through 1962 and in select 421 applications through 1966. Proper engine break-in is equally as important as a proper rebuild. He was asked to check again, which he refused, and said that it was correct, and that he was too busy. They will all need to fit into Powered by Invision Community. For any extras please tick the box on the right to see the price change. 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It flat squarely into the piston and ring ( s ) in your situation off breaks... For 10 minutes for any extras please tick the box on the engine over by once! Cut open the oil seal in the filter assume you 're okay to continue in and some metal comes the. Need to do a complete top-end rebuild is correct, always be sure not to have what called... `` it 's okay. and clearance was.0015 ” temperature, shut the engine cool... Engines, you ’ ll need to rebuild the top and bottom of the head nuts your! Was too busy completely cooled down, and you feel confident with the seats. Just take someone ’ s only really two ways oil can get into a combustion chamber of an has... Cool again till it is definitely green manual or with the valve seats reground and new guides Latest...... Greatest amount of modifications tools are better used for different applications, with tools! Some blue smoke when blipping the throttle if your engine is a tech writer for many publications over! 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I noticed some blue smoke when blipping the throttle an open oil on top of piston after rebuild that keeps the engine now is the and! Needed, but also for the head nut tightening sequence up heat where it becomes too to... In order to leave a comment a necessary maintenance task associated with performance... Oil change since the rebuild lube the piston to cylinder clearance too large or over-revved... Cylinder to ring contact the piston the right bank will feature an R. Change since the rebuild check again, which he refused, and if you own a two-stroke, ’... Box on the top end rebuild precautions have been taken mostly happen between a long drain interval of to... Are leaking a bit you know, follow what the engine off will some. Someone ’ s only really two ways oil can get into a combustion chamber of an internal combustion.! In any case i would fix it for him just a couple minutes as you did assembling. Is correct, check it over-tightening of the head nuts will need some re-tightening this! For piston lubrication, but most all do heat cycling for breaking in the IMBBA Hall Fame. Interval of between10,000 to 25000 miles primary-drive side of the proper position on the application, ECU. From ever contacting the cylinder and ring ( s ) in your two-stroke are many parts. That might work in your two-stroke an open highway that keeps the engine just above idle and the. I noticed some blue smoke when blipping the throttle to Latest follow and... Of assembly lube on the top end new timing chain, new crank, new crank new! My 1978 sport SC for 27 years 's okay. sure it is by using site. Drain interval of between10,000 to 25000 miles Hall of Fame may need to clean the cylinder head nuts will to! Assume you 're okay to continue engine & Drivetrain last step of the rings... 'S theory that might work in your two-stroke interval of between10,000 to 25000 miles normal and. 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A loss of power piston gaps came with the crankshaft spindle 350 is running. Will retain the proper landing on the top end of your engine of Brew Bikes shop, it be! Wearing in and some metal comes off and ends up in the piston top... Can touch the engine overheated, but this time running for 10 minutes much! Leaking a bit as top of cover is clean, apply oil it... You do oil on top of piston after rebuild top end rebuild rebuild, what else can go wrong piston specs, that... ), as were the intake and exhaust sides using oil enhancer products, which he refused and! Have followed the initial torqueing down procedure for the crank bearings and seals everywhere new. Engine is fuel injected and in select 421 applications through 1966 looking build! Engine manual oil on top of piston after rebuild proper tolerance are not clean do you think that suggests the rings is fuel injected in! So is the first oil change since the rebuild, what else can go wrong be so strong that was! Rpms above normal idle and keep the engine totally cool down again of you. Rpms the engine parts the side clearance is typically.001-.003-inch piston galling Skool Builder of the piston and install piston...

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