Makes me Wanna Cry... Unimog

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lost a injector line, possible engine damage - PeachParts Mercedes ShopForum

Please reply to the above post,I've reposted it over here for him in hopes somebody
can come up with a Miracle.
Thanks!

Registered User
Join Date: Mar 2010
Location: London, ON
Posts: 1


lost a injector line, possible engine damage
hello, first off I'm new here, was searching the internet for a fix to my new to me 1970 mercedes Unimog with a mb OM352 engine. I'm also over at benzworld

Was a fresh rebuild when I bought it, the injector feed for #2 cylinder was loose it turns out, on the drive home it pumped the oil sump full of diesel. (it's under the valve cover)

ran decent, couldn't hear it miss a beat. heard it make some strange noises just as I got to my street, shut it off, towed it home. there was 3 inches more oil in the engine then when I left for home, a 5 hour drive, and a lot dripping down the front of the engine and sprayed all over.

changed the oil and fired up, no noises at idle, some at higher rpms. I retorqued the cylinder head and adjusted the valves as the sounds sounded more like ticks, now it smokes and makes a regular hammering sound, but doesnt seem like every revolution, only every other, making me think it's something to do with that #2cylinder. Again, i could be wrong. Felt the exhaust manifold, 2 seems a lot cooler then the others.

I was told leaky injectors make horrible sounds, I'm thinking tomorrow i'll pull and swap 2 and 6 see if problem moves over.

Could the injector or pump have been damaged by 2 not having any pressure in the lines? took 5 full turns to tighten the fitting

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[camerafodder]

Sorry CI, no miracles from me I'm afraid. I feel an engine stripdown coming on. The occasional knock he hears my be injector related but it may be a problem with that cylinder like a cracked piston crown etc... At the very least I think I'd whip the head off first and have a look. The excess fluid levels in the sump may have blown a seal or two as well. Not sure how much damage may have been done to plain bearing surfaces and I dont think the OM352 has a turbo unless its been upgraded in the past. If he needs spares and advice the best place to start would be AC Price Ltd at Ingleton, they are Mog main dealers for the UK and very helpful chaps.

AC Price Engineering - Home

Sorry I cant be more helpful.

 

[corned]

Unfortunately, I don't think the person with the problem is UK based. Looking at the details above, I believe he's in Canada. There's a London in Ontario.

 

[camerafodder]

Thanks Corned I hadn't noticed the 'ON' bit at the end

 

[grober]

These OM352 engines are found in a large no of commercial vehicles and even combine harvesters! I assume they will have renewable piston ring and cylinder liners kits available from many commercial vehicle sources--- don't know. Sounds as if the diesel fuel has diluted the lubricating oil resulting in damage to the cylinder bores or piston rings. Only way to find out for sure is to take it to specialist familiar with these large commercial diesels which may entail a partial strip down to investigate as suggested.