Description
Replacement Piston Rings
Roary the Repair Lion says:
Pistons rings need replacing when:
1) Dirty, low quality or the incorrect oil has been used - do not use old or synthetic oil as this damage piston rings. See model page for correct oil for your engine
2) Contaminated fuel has been put into the engine - check state of fuel and fuel tank for rust. Replace fuel tank filter and strainer. Replace fuel tank if rusted.
3) The piston rings were not cleaned or not fitted correctly
Diagnosis:
A) Remove the cylinder head.
B) Rotate engine until the piston is almost at the top of the stroke
C) Put a teaspoon of clean oil onto the head of the piston
D) Leave overnight
If the oil has disappeared in the morning, you need to replace the piston rings.
Things to check before purchasing:
1) Inspect valves, valve retainers, rockers and push rods for damage. Replace as necessary. Part available under "cylinder head parts" on the model page.
2) Check if there is damage to the Cylinder Block, such as deep scrapes from the damaged piston. If so, you will also need to replace the Cylinder Block. (Please contact us if you require a new Cylinder Block and cannot find it on your model.)
3) Check both Oil Seals - There are two oil seals. Each located at either end of the crankshaft. When you remove the crankshaft, they might get damaged and need replacing. A damaged oil seal will leak! Replacements are available on the model page.
4) Check the bearings on the crankshaft and in the side plate for damage - Replace if there is any play, wobbling, is hard to turn or are any noises when turning. They are sold separately on the model page.
5) Be sure the cam shaft decompression weight moves freely and springs are not worn out. Clean or replace if necessary. Replacements are available on the model page.
6) Check gears on the camshaft and crankshaft for damage. Replace if necessary. They are both available to purchase on the model page.