Can blow by be fixed by honing and new rings on 245K mile motor?
 

Can you put rings in a 245K mile motor or does the motor most likely need new sleeves and pistons? Just curious if anyone has tried just rings in here?
Thanks,
Dave

The only way to tell anything is by removing the head and measuring the taper in the cylinder. If it is within specs you can hone and ring. If not then sleeves are in order.

If it starts and runs well you probably should keep driving it.

Tom W

I was thinking the same, just curious, thats all.

Short answer...no

At 245K, chances are you will need new pistons.

I think tryin to fix blow-by is like tryin to cure diesel clatter and rattle. If it runs then drive it as Tom said. And never heard of diesel engine not lasting 350k+ miles if maintained. Rules of these beasts is either they run with tight compression or they dont. Why should anybody care if intake manifold drinks oil from the crankcase? Hell, its probly one of several diesel features that adds to engine longevity.

Your "curiosity" is ridiculous and has nothin to do with sustaining the car at optimum performance level, given its mileage and potential for another couple hundred thousand miles. At that mileage I'd worry more about timing chain-stretch than anything else.

Thanks for your input about the time chain stretch, but my curiosity is how I learn.
Dave

You can, but if you're taking the head off, you may as well put in new seals, seats, grind the valves, put in new retainers, and throw pistons and bearings at the thing...It won't be very expensive and it will be like new afterwards...

Nick

Dieseldog is usually more friendly in his comments. I doubt he meant to be too harsh.

Good luck with your diesel.

Tom W

Not very expensive is not a term I would use in describing all the work above.

Most likely most of the above will not be needed, but if you take the head off you should definately have a professional machinist check them for conformance to mercedes specs for usable parts.

Tom W

any machinist that knows how to compare numbers can do it, ;)

$1288.86 for a set of Mahle pistons :eek:

I'll run it after I check the time chain and fix any oil leaks....

"Someday" I'd like to rebuild one, but I'd rather drive em.

I've heard the pistons can be reused and seldom need replacement unless you can't match them back into the block after re-sleaving.

I've never heard anyone ever successfully rebuilding a 617. too expensive, too crap diesel guzzling of an engine to even mess with etc etc. but that's from a professional point of view. (mine, in a way, but mostly the people I work with)
what engine are we talking about here anyway?

I have done a three of them, two turbos and one na. I have one of each at present.

Working just fine thank you.

They aren't cheap to rebuild though, even if you don't buy new pistons, which we usually don't need.

Tom W