I appreciate this is gasoline related terminology but in this instance probably close to the actual issue described.

in older gasoline engines this pre-combustion used to result in a 'knock' or 'pinking' as fuel ignited before TDC.

My thinking centers around the components that could either retain hot carbon (pre-chamber) or sustain damage and burn (glow plug tips).

The other aspect is the ATDC start of delivery for fuel, if you have something glowing it could potentially detonate at TDC causing perhaps mailing or other knocks?

Asking this, as i have seen very little on the subject, perhaps it doesn't exist as described hence lack of coverage.

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)

I've never heard of it. Maybe if you sprayed starting fluid into it you'd get some pre-detonation.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Yup, perhaps with old carburetor engines with fuel being pulled in on the down stroke thereby being present all the way up (combustion stroke), not so with diesel with fuel injection and ATDC fueling.

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)

There isn't anyway for an IDI like this to predetonate.. all the fuel is in the pre-chamber before it trickles into the bowl on top of the piston..

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

A failing om60x hydraulic lifter sounds a lot like knock on a gasoline engine.

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CENSORED due to not family friendly words

is this a regional term "pink" i have never heard of it. Only the term "ping"

Tj, you seem pretty knowledgable on the issue with the hydraulic lifters failing on the om603. I'm working on a 603 TD wagon with bad lifters and the cam has some spots of wear from the cylinders with bad lifters.. Do you think anyone can safely machine the cam short of replacing it? They aren't easy to find in as good condition as I'd like...

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

you can always have the cam re profiled, you would just need to know the specs for the duration and lift. The weld it large and machine to size, then heat treat it.

Sorry I have no idea. I've seen a few online vendors offer new om603 cam for $300-400 range.

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CENSORED due to not family friendly words

Diesel engines can "gasoline" ( my term), if way too much fuel is thrown at them. As in tractor pullers that throw so much fuel and early injection timing that the motor nearly hydrolocks.

"Pinking" is British for "pinging".

Diesel engines can certainly nail, which sounds similar. Nailing seems to occur when combustion is incomplete, so some burning continues in the exhuast manifold. More likely with low cetane fuels, or running a very cold engine. My old 300CD would nail a bit until it was warmed up. And my 190D had some nailing until I had a couple of bad valve seats replaced.

You can also get preignition in a diesel engine if you use an inappropriate fuel, like gasoline. Just like in a gasoline motor, it is very damaging.

I changed my original post from 'petrol' to 'gasoline', never thought about about the pinking/pinging thing

Maybe at push get some sort of pink/ping with oil vapour from poor stem seals or excessive EGR gunk, mine had the valve timing out by a fair margin resulting in caked heat shields/injectors.

__________________
David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)