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No compression on one cylinder
Posted: Sun Aug 20, 2017 4:33 pm
by N40toy
Afternoon all, I was wondering if anyone could help. My 3.5 v8 rover engine has zero compression and the cylinder next to it has 50. Car uses a little bit of water, uses no oil. Any thoughts?
Posted: Sun Aug 20, 2017 5:44 pm
by DEVONMAN
Which number cylinders are they?
Posted: Sun Aug 20, 2017 9:15 pm
by N40toy
I'll check with my mechanic in am bu think he said it was cylinder 5. Did try to private message you not sure if it went through? New to this site. What you thinking?
Re: No compression on one cylinder
Posted: Sun Aug 20, 2017 11:46 pm
by unstable load
N40toy wrote:Afternoon all, I was wondering if anyone could help. My 3.5 v8 rover engine has zero compression and the cylinder next to it has 50. Car uses a little bit of water, uses no oil. Any thoughts?
Does the car have a noticeable misfire?
Could be a stuck valve or a holed piston. As for the low pressure, how much are the other pistons' pressures?
The easiest way to see what it is is to connect an airline to the cylinder and apply light pressure. If it's a valve, it will come out the inlet or exhaust, if it's a piston, then it will come out the oil filler.
Posted: Mon Aug 21, 2017 8:15 am
by DaveEFI
N40toy wrote:I'll check with my mechanic in am bu think he said it was cylinder 5. Did try to private message you not sure if it went through? New to this site. What you thinking?
Ah - this isn't something you've measured yourself?
True zero would be most unusual without other symptoms. It would need a hole in the piston, or the cam so worn a valve wasn't opening, etc.