no compression on cylender one

[nick]

Hi guys, I have no compression in cylender one so I thought that my engine is gone (piston or piston ring). My michanic says that it maybe a bent valve.
what do you guys think. I was hopping it is coz I dont wanna change my engine if posibble. Please help. BTW all 3 other cylender was 150 on compression.

 

[93AWDDSM]

Try a leak down test, also did you do the compression test?

 

[nick]

Yeah I did the compression test. All 3 was 150 in I got 0 on cylender 1

 

[93AWDDSM]

ok, move on to a Leak down test.

 

[nick]

Thats the next one I'm going to do. But is it posible that just the bent valve, or I'm looking for a new engine?

 

[93AWDDSM]

you could always do the oil test, where you add a very small amount of oil to the low compression cylinder and see if it raises it when you do another compression test. That could be worn piston rings. If you do the leak down you should be able to pinpoint if a valve is bent and leaking where is coming from either intake or exhaust on cylinder 1.

 

[nelliott500]

As far as I'm aware, the oil test only works if you have low compression, not 0 compression.

 

[GofaST4life]

If you have a bent valve, you would need a head rebuild, not a whole new motor, necessarily.

 

[nick]

I put oil when l did the compression but it did not change at all.

 

[TofastForU_99]

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[dsmaz]

You could always take your head off and check your valves and see if your pistons move side to side. That should help you pinpoint your problem