I have an acquaintance who's just emailed me asking about compression specs for a prospective buy he's contemplating.

He's had a compression test done and the numbers are thus:


1 - 390
2 - 410
3 - 390
4 - 390
5 - 390
6 - 390

Can anyone furnish the service limit and normal range for this engine? To my eye, these look quite good for your garden-variety diesel, but without real specs I am only guessing.

__________________
Regards,
Al S.
NissanDiesel
----------
1999 E300 (W210, OM606.962 turbodiesel),green.
1975 W115 300D (sold 1998)
1982/1981/1983 Nissan Maxima diesels w/LD28 Six (all sold)
1983 Nissan Sentra diesel CD17 (gave away in 2010)
Many 1981-82 Nissan 720 diesel pickups SD22 (all gone)

Bump.

__________________
Regards,
Al S.
NissanDiesel
----------
1999 E300 (W210, OM606.962 turbodiesel),green.
1975 W115 300D (sold 1998)
1982/1981/1983 Nissan Maxima diesels w/LD28 Six (all sold)
1983 Nissan Sentra diesel CD17 (gave away in 2010)
Many 1981-82 Nissan 720 diesel pickups SD22 (all gone)

First, what is the year/model of the car being tested?
Mileage on the car?
Maintence records?
Frequent oil changes?
These questions will help give better responses from people.

A diesel needs 300+psi to be "healthy."
255psi minimum to ignite Diesel.
There is no max. as far as I have ever seen.

Anything, to me, above 350psi on a small diesel is good.

I say you have very good compression. Take care of it.

Subject line.Addressed in the first sentence of my post. I'm seeking MB's specifications, not opinions on whether my acquaintence should or should not purchase the vehicle.

Does anyone have the MB numbers on service limit (that's the lowest number that's considered normal before a rebuild is needed) and range?

__________________
Regards,
Al S.
NissanDiesel
----------
1999 E300 (W210, OM606.962 turbodiesel),green.
1975 W115 300D (sold 1998)
1982/1981/1983 Nissan Maxima diesels w/LD28 Six (all sold)
1983 Nissan Sentra diesel CD17 (gave away in 2010)
Many 1981-82 Nissan 720 diesel pickups SD22 (all gone)

Fine, I was just telling you what was needed for a Diesel engine...

Service limit is 300 psi, new condition is about 425, I think (last number may be off).

The compression in that engine is fine. I believe the compression ratio is something like 20.5 to 1, but I don't remember exactly.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Thanks for your help. I appreciate that info. I'll pass it along .

__________________
Regards,
Al S.
NissanDiesel
----------
1999 E300 (W210, OM606.962 turbodiesel),green.
1975 W115 300D (sold 1998)
1982/1981/1983 Nissan Maxima diesels w/LD28 Six (all sold)
1983 Nissan Sentra diesel CD17 (gave away in 2010)
Many 1981-82 Nissan 720 diesel pickups SD22 (all gone)

FWIW. I usually see 400 to 410 PSI on an engine with fresh rings, valve job, and NO carbon.

__________________
You can get farther with a smile and a gun than you can with just a smile.

1984 300D
1985 300CD
1980 300SD
1993 SL500

377-464 psi with the range within the engine not exceeding 44 psi are specifications for a NEW engine. The numbers you post are well within that range.

Marshall