Waking up from a 20 year sleep! 220seb - PeachParts Mercedes-Benz Forum

t walgamuth · #1 09-30-2020, 08:40 AM

Quote:

Originally Posted by letank

what a find... as for the turn over after 20 years, the crank and cam bearings are dry, you need to find a way to prime the oil pump without cranking the motor, which would certainly damage the bearings.

I am not familiar with this model... but I suspect that it is chain driven, manually priming the oil pump for a certain time to push the oil around, you have to slowly turn the crank another 90 degrees and continue the process until you have gone around a full 1 or 2 crank rotation.

In some engines you pull the distributor to have access to the oil pump, in others you can disconnect one of the oil passage and pressurize the system, monitoring the oil pressure via the oil pressure gauge if you have one, or install a mechanical oil pressure gauge

Good luck

I don't get where you find any factual basis on claiming the bearings are "dry". The only way you could get there is to disassemble the engine and clean all the bearing surfaces of all lubrication, then reassemble.

The actual situation IMHO is more likely that the engine was running and pumping oil right up until it was parked so that lubrication is in there and cannot get out. So whatever lubricating properties are left are, well, still there.

I'd lubricate the cylinders with marvel mystery oil and turn it over a bit to assure the pistons and rings are not siezed then fire it off.

I'd be a lot more cautious with the mechanical injection system. If it were a diesel you probably could just fire it off. With the lack of lubricating capabilities with gasoline you need to be very cautious with the pump.

letank · #2 10-04-2020, 06:19 PM

Quote:

Originally Posted by t walgamuth

I don't get where you find any factual basis on claiming the bearings are "dry". The only way you could get there is to disassemble the engine and clean all the bearing surfaces of all lubrication, then reassemble.

After 20 years, it may not be chemically dry, but the lubricity of what is left should be considered severely compromised, akin to cold starting an engine after a couple of days. This is my understanding of why the oil recommendation is getting a smaller lower sae number, such as 5w30 getting away from 10w30. The initial start up is the critical factor in any engine designed last year or 50 years ago.

Oil TSM from the ancient times aka the early 70's, recommend to drown the engine in oil if extended storage over 6 month is expected: fill the oil pan as much as you can, and dump oil to intake till overflow... repeat for cylinders... can you imagine the labor intensive restart procedure?

I had an engine waiting on an engine stand for over a month, and yes there is always an oil dripping stain, but in this case the history is different.

I have no issues with an engine being cranked every other year which has fresh oil, and being driven at operating temp for 15min.

Yes the oil topic will always bring many lines of discussions and interpretations.