1984 190D compression test - Page 4 - PeachParts Mercedes-Benz Forum

04 Diesel · #46 03-27-2010, 09:07 PM

Quote:

Originally Posted by layback40

What does the bore in #3 look like?
any damage?

Yes, damage. First picture is back side of piston wall, second picture is front side of piston wall. See the groves? I can feel some in #2 also.

04 Diesel · #47 03-27-2010, 09:12 PM

Quote:

Originally Posted by PaJon

Can you post a good picture of the head gasket, both sides please.

Here you go.

sasquatchgeoff · #48 03-27-2010, 09:21 PM

Quote:

Originally Posted by 04 Diesel

Yes, damage. First picture is back side of piston wall, second picture is front side of piston wall. See the groves? I can feel some in #2 also.

I have recently gone the exact same route with an '84 601. Ironically, the rings were broken on that unit also (pieces of them were in the oil pan - must be a common failure point). At that point in the game, I went with another engine that turned out to be in great shape. Having a machine shop re-sleeve and dress that block, the potential need for new pistons (can't tell if they're still good from the pics) rod bearings, crank bearings, etc - it all adds up to considerable expense. The second engine cost us $450 - less than the cost of pistons alone.

04 Diesel · #49 03-27-2010, 09:25 PM

Quote:

Originally Posted by sasquatchgeoff

I have recently gone the exact same route with an '84 601. Ironically, the rings were broken on that unit also (pieces of them were in the oil pan - must be a common failure point). At that point in the game, I went with another engine that turned out to be in great shape. Having a machine shop re-sleeve and dress that block, the potential need for new pistons (can't tell if they're still good from the pics) rod bearings, crank bearings, etc - it all adds up to considerable expense. The second engine cost us $450 - less than the cost of pistons alone.

Where did you find a good used engine? Around here I dont see many mercedes in the junk yards.

04 Diesel · #50 03-27-2010, 09:28 PM

Also the guy I bought the car from has the first motor that he is going to give me but Ill have to see what is wrong with that one also. I hope the bottom end is in good shape on that one.

sasquatchgeoff · #51 03-27-2010, 10:09 PM

A junkyard in Southern WA state. It was a lucky find, but those engines are still around. Be patient and deliberate. Looks like there are at least a couple not so far from you:

190 transmission question

04 Diesel · #52 03-27-2010, 10:15 PM

I want to see what #1 and #4 are like, I guess I shouldnt worry about keeping timing any more. I want to turn the motor and check 1 and 4, or should I not?

layback40 · #53 03-27-2010, 10:27 PM

As I think you already know, #3 has broken rings I agree with others that you would be better of with another motor.
I would be investigating if a 602 would fit.

chasinthesun · #54 03-28-2010, 11:40 AM

O4 DIESEL ,PM SENT FOR YOUR REPLACEMENT MOTOR ,2.2 IN EVANSVILLE ,HOPE EVERTHING WORKS OUT .

04 Diesel · #55 03-29-2010, 04:36 PM

What you guys think about me replacing all the rings on all the pistons, there is not much damage on the cylinder walls? Or would that be a waste of time and money?

sasquatchgeoff · #56 03-29-2010, 04:44 PM

Those sleeves APPEAR to have more damage than I would want to live with.

04 Diesel · #57 03-29-2010, 08:07 PM

Quote:

Originally Posted by sasquatchgeoff

Those sleeves APPEAR to have more damage than I would want to live with.

I guess I would loose to much compression?

sasquatchgeoff · #58 03-29-2010, 09:35 PM

Premature wear on new ring set, etc, etc. Once you get to the block and associated moving parts, cutting corners never pays off. Since this is a marginally funded project car, and restoration is not on the agenda, the logical choice is another engine with (hopefully) less miles.

sasquatchgeoff · #59 03-29-2010, 10:03 PM

Take it for what its worth. Straight from the FSM -

"When evaluating scored or streaky cylinder running
surfaces, it is often hard for workshop to decide
whether the damage is already significant and requires
removal or repair of engine, or whether the marks are
insignificant. The following information will help to
make an expert and correct decision.
The first difference on cylinder running surfaces is
between “optical streaks” and “seizure streaks”. In
most cases, “optical streaks” are about 3 mm wide
and are caused by ring gap, on which honing traces
are still visible; with “seizure streaks”, however, the
honing traces are no longer seen.
With “streaks in direction of land” (in direction of
piston pin) shaft streaks or seizures are not possible,
since there is no contact between piston skirt and
cylinder liner."

Factory honing marks are the key. If you can see them, you MAY be OK, if they are not still visible, the sleeve needs to be replaced. Since replacing just one or two sleeves is not an option, uhhh, I think you get the picture.