1965 190Dc Possible head gasket failure. Diagnosis help. - Page 3 - PeachParts Mercedes-Benz Forum

bricktron · #31 10-01-2013, 02:22 AM

you in the federales DrCherry? good luck on your repair, i imagine it'll be fine.

DrCherry · #32 10-04-2013, 03:04 AM

Not feds but the doomed newspaper industry.

Under the tutelage of whunter I was able to get the head off. Here is what I found.

Water in this cylinder. Soaked it up with paper towel.

Guys, I found the problem.

These look a little dirty.

As instructed, I coated the parting surfaces with gear oil and dumped inexpensive oil in the cylinders.

Next steps: Clean the parting surfaces and the head and look for cracks. How much does it cost to get heads tested?

DrCherry · #33 10-04-2013, 03:40 AM

Here's a link to the super-duper closeup of the gasket failure.

http://defcode.com/wiki/images/9/96/DSCF0093.JPG

whunter · #34 10-04-2013, 02:24 PM

Quote:

Originally Posted by whunter

cylinder head gasket
MB# 6210161620

Here is what damage you need to look for on the cylinder head.

Cavitation
Cavitation

1980 240D CRACKED cylinder head + cavitation damage
1980 240D CRACKED cylinder head + cavitation damage

1985 300TD head gasket repair
1985 300TD head gasket repair

Diesel cylinder head issues thread

.

Glad to see you are making progress.

I assume it was not a difficult job when you got into it..

As you will note from all of these links, your next step is extreme cleaning - inspecting the cylinder head parting surface for cracks.

If no cracks are found:
* Remove the valve springs, use a dial indicator to check the valve for slop in the guide.
* If the guides are bad = have the cylinder head serviced = new guides + reface the valves - seats.

With any luck, it should be running again in a few days.

.

KCM · #35 10-04-2013, 03:36 PM

Sounds like you got lucky, in a way. At least it looks like nothing major. Once everything is cleaned up, definitely take a precision straight edge to check the head and block for warpage before going much further. Don't know the specs off hand, but usually can't have more than a couple thousands (maybe 3 or 4) variance. Since you have the cylinder head off anyway, I would do what whunter said and definitely take it to a machine shop and do a valve job (grinding valves and checking/replacing guides and seals), if your budget allows. Preventive maintenance. Using a 4-1/2" grinder with a fine wire brush, or hand brush, clean the head combustion areas to get them cleaned up. Cracks will usually be visible to the naked eye, but from the pictures, don't see anything major so far. Visually check prechambers to make sure balls inside are supported on both ends and not burnt and pitted. If they are not supported on both ends, the prechamber must be replaced. Also closely check end of prechamber that sticks into the combustion chamber for cracks between the holes. If there any cracks, this requires replacement as the end can break off and cause piston damage. Good job on the oil on the pistons. This should seep past the rings and keep them lubricated, hopefully displacing any antifreeze that seeped down.

DrCherry · #36 10-10-2013, 02:38 PM

Okay here is my catalog of cracks in the head. Continue cleaning or go in another direction?

There are two cracks between the end of a pre-chamber and the valve seat. All four seem to have cracks on the opposite side of the valves.

whunter · #37 10-10-2013, 03:34 PM

Quote:

Originally Posted by DrCherry

Okay here is my catalog of cracks in the head. Continue cleaning or go in another direction?

There are two cracks between the end of a pre-chamber and the valve seat. All four seem to have cracks on the opposite side of the valves.

The cylinder head is junk at this point.
Strip the parts for later need, including pre-chambers, plugs, and all studs.
You should be able to find a good used unit to replace it.

.

DrCherry · #38 10-10-2013, 07:27 PM

All right, thanks for the expert eyes on that whunter. I'm going to clean the top of the block and see if I can find any cracks.

Any science to doing this? Should I just leave the oil in the cylinders?

whunter · #39 10-10-2013, 10:00 PM

Quote:

Originally Posted by DrCherry

All right, thanks for the expert eyes on that whunter. I'm going to clean the top of the block and see if I can find any cracks.

Any science to doing this? Should I just leave the oil in the cylinders?

Wipe them out, vacuum the perimeter gap around the piston.

Apply a light coat of axle grease to the cylinder walls and pistons.

Use plenty of razors while scraping the block face.

.

KCM · #40 10-11-2013, 11:44 AM

Like whunter said, the head looks unusable. The cracks between the prechamber and valve seat, and between the valve seats killed it. When looking for a used head, you need to use caution. Every used head on these engines I've seen tend to have cracks radiating from the prechamber, which is not bad as long as they are not over 1" long or so (I've used heads with those cracks without a problem). But you will need to make sure none reach the valve seats before buying.

To clean the block, you can use a 4-1/2" angle grinder with a fine wire cup brush instead of a grinding disc. Apply light pressure. Won't damage the block and helps speed up the cleaning process.

TnBob · #41 10-11-2013, 01:49 PM

Brass brushes are a good tool to use. Gets the gunk out and offers almost no ability to damage any motor component.

whunter · #42 10-17-2013, 12:29 PM

any luck finding a cylinder head?

.

DrCherry · #43 01-15-2014, 11:36 PM

I've just started looking for a head for this vehicle. I'm starting on the heckflosse mailing list on yahoo. If you know anyone that has one, I'm very interested. It's a 65 190D W110 OM621.

daw_two · #44 01-16-2014, 10:53 AM

Quote:

Originally Posted by DrCherry

I've just started looking for a head for this vehicle. I'm starting on the heckflosse mailing list on yahoo. If you know anyone that has one, I'm very interested. It's a 65 190D W110 OM621.

I can help. PM sent.

DrCherry · #45 05-29-2014, 12:11 PM

Totally striking out on finding a new head for this motor. What other motors will fit in this vehicle? I'm considering a remanufactured motor and possibly doing a bit of body work. Thoughts?