Low compression advice required

[Jonny]

Hi there,

My 1230EFE engine was running very rough the other day so I decided to do a compresion test on it. It was putting out less power than it should even when it was running okay, so it was one of the first things I decided to do. The results were:

1 = 12

2 = 4

3 = 10.5

4 = 12

I did a wet test and it made no difference. If anything it dropped on number 2 to about 3. I reset all the valve clearences but it made no difference.

I'm gussing that the next thing to buy a leak down test kit? Or is the compression on 2 so low it points to something else?

What should I do next?

Thanks

 

Jonny

[Fjbj40]

Those numbers can't be PSI ?

[Jonny]

24 minutes ago, Fjbj40 said:

Those numbers can't be PSI ?

No - kg/cm2

[Jonny]

3 minutes ago, Jonny said:

No - kg/cm2

 

[bluedog59]

Time for a leak down test. If you're lucky you've got a poor valve seal on #2, if not........

[BigT]

It could be that your fuel tap is leaking fuel down the vacuum line into #2, washing out the cylinder

[Gixer1460]

1 hour ago, BigT said:

It could be that your fuel tap is leaking fuel down the vacuum line into #2, washing out the cylinder

Yes - but it would have picked up or stayed the same with oil down the bore. I think you've got a burnt valve or two. Other cylinders aren't bad but an over bored EFE @ 10:1 CR? I would have thought nearer 180psi or 12.75 on your gauge should be the norm?

[kiwi]

Jonny  preferred the red numbers because there's less

[gs7_11]

If the wet test made no difference, no 2 is fooked. Either way, head off and investigate.

[Jonny]

22 hours ago, Gixer1460 said:

 I would have thought nearer 180psi or 12.75 on your gauge should be the norm?

To be fair the needles were a little over 12 and the engine was cold, I might be getting close to 12.75 if it was warm.