Back in August 2010, I had posted the results of our compression testing. No matter what we did, the 3rd cylinder always reported abnormal results. Well, I am pleased to announce that we believe we know what the cause is...the top piston ring of piston 3 was stuck.
Removing the piston rings on the first pistons were pretty straight forward. Dig you nails into the gap and pry off the ring. With the 3rd piston, however, the top ring was stuck in its groove. The ring would not spin in the groove or dislodge easily (other rings moved freely in the groove). It took Fred a while to finally pry it loose.
The guess (not an expert opinion) was that the stuck ring caused the 3rd cylinder/piston to not have good compression. (The stuck ring impacted the travel of the piston in the cylinder.)
After removing the rings, we snapped a few old rings in half and use these as a tool to scrape out carbon residue built up in the ring grooves. The piston heads then went through some wire brushing to make everything nice and clean before installing new rings.
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| For the bottom ring, installation order matters. The waffle ring is installed first and then the top and bottom rings are installed. (There are slight grooves in the waffle ring that the outer rings sit in.) This is useful to keep in mind when removing the bottom ring as well - take the outer rings off first. |
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