P38A P38 2.5 dse engine noise?

Hi fellas has been a while since I posted here. P38 still isn’t finished.

Today I did a compression test just out of curiosity because the engine has been rebuilt a while back. And since the head wasn’t exactly flat I wanted to see how a test like this would work out.

Now I only did a dry test and these are the results.

1: 390 psi
2: 360 psi
3: 390 psi
4: 390 psi
5: 390 psi
6: 390 psi

The measurements have been performed using a glow plug insert with the exception for cylinder 2 where I used injector insert because the fip is in the way to use glow plug method.

What do guys think about these numbers? And what about the difference for cylinder2? Could the difference be attributed to the difference in the way it was measured?

Anyways unfortunately a glow plug wire shorted out while measuring and screwed up the glow plug fuse. Does anybody now if the fuse can be replaced without changing the entire unit (relay and fuse)?

BDC said:

Hi fellas has been a while since I posted here. P38 still isn’t finished.

Today I did a compression test just out of curiosity because the engine has been rebuilt a while back. And since the head wasn’t exactly flat I wanted to see how a test like this would work out.

Now I only did a dry test and these are the results.

1: 390 psi
2: 360 psi
3: 390 psi
4: 390 psi
5: 390 psi
6: 390 psi

The measurements have been performed using a glow plug insert with the exception for cylinder 2 where I used injector insert because the fip is in the way to use glow plug method.

What do guys think about these numbers? And what about the difference for cylinder2? Could the difference be attributed to the difference in the way it was measured?

Anyways unfortunately a glow plug wire shorted out while measuring and screwed up the glow plug fuse. Does anybody now if the fuse can be replaced without changing the entire unit (relay and fuse)?

Click to expand...

I would put the difference down to the different measuring method. No idea if the pressures are within spec without looking at RAVE.

More than 10% then I'd worry about it, as Keith says the different techniques could produce different results depending on the quality and sealing method

Did you do the same with a drop of oil in each cylinder or just a dry test?

Mark Piercy said:

Did you do the same with a drop of oil in each cylinder or just a dry test?

Click to expand...

Only dry test, I had to cut short the testing because the weather changed and I didn’t fancy doing this in the rain

I looked it up in rave compression test should yield results bigger than 20bar. It did not specify what the compression looks like when new.
Google search and other forum say it is 400psi or 30 bar when new but not sure if this is accurate.

BDC said:

Only dry test, I had to cut short the testing because the weather changed and I didn’t fancy doing this in the rain

I looked it up in rave compression test should yield results bigger than 20bar. It did not specify what the compression looks like when new.
Google search and other forum say it is 400psi or 30 bar when new but not sure if this is accurate.

Click to expand...

So your pressures are as good as you could expect.

Datatek said:

So your pressures are as good as you could expect.

Click to expand...

Well that’s provided that the data I found is correct. It is minimum 20 bar I measured 25 and 27 bar. But I suppose it’s fine then.

BDC said:

Hi fellas has been a while since I posted here. P38 still isn’t finished.

Today I did a compression test just out of curiosity because the engine has been rebuilt a while back. And since the head wasn’t exactly flat I wanted to see how a test like this would work out.

Now I only did a dry test and these are the results.

1: 390 psi
2: 360 psi
3: 390 psi
4: 390 psi
5: 390 psi
6: 390 psi

The measurements have been performed using a glow plug insert with the exception for cylinder 2 where I used injector insert because the fip is in the way to use glow plug method.

What do guys think about these numbers? And what about the difference for cylinder2? Could the difference be attributed to the difference in the way it was measured?

Anyways unfortunately a glow plug wire shorted out while measuring and screwed up the glow plug fuse. Does anybody now if the fuse can be replaced without changing the entire unit (relay and fuse)?

Click to expand...

They're good.

RAVE says "at least 20 bar", so as the lowest is 360psi = 24bar, I would agree they are ok..

For the fuse I needed I found that these work

AERZETIX - C10285-5 x tape protection - 80А - with miter shovels - for high current - fuse holder
https://amzn.eu/d/bixpPaU