Cylinder 1 is toast!

[xnology 0]

Looks like it is rebuild time.

 

I just finished up a compression test on a stock G60 (pg) engine.

 

2,3,4 all at 135 lbs.

 

1 only made 25 lbs. and that is being generous to the gauge.

 

Any advice for somebody about to get elbow deep into the engine?

[coolrado 0]

It was cylinder 1 on mine that was dead and i have seen a few PG blocks with scoring to bore 1, my number 1 piston had litterally fallen apart, although the rings where still intact, they where the only things holding the piston together.

 

when you remove the oil filler cap with the engine running is there a lot of pressure or pulsing pressure? it should be no more than a gentle fluttering sort of pressure.

 

have you tried pouring a small amount of oil into the cylinder and then try the compression test again? if the compression increases with the oil it's usually a good sign that the rings are fubar, if not it usually points to valves.

[xnology 0]

When I did the timing, I cracked the oil dipstick tube extension without realizing it and she spewed oil all over when I drove it down the street. I haven't run it with the filler cap off, but I will try tonight.

 

I will also try the oil in the cylinder trick and retest the compression. This is great information.

 

Thank you.

[boost monkey 0]

aka leakdown test :salute: