Hi one and all,

A bit of a mechanical question...

What is the engine likely to do if my engine had:-
1) sticky exhaust valve
2) sticky intake valve

Reason for question is, on a cold start up one cylinder is a bit lazy and takes up to 15 seconds for it to wake up: Result is an engine shaking around and then levels out to a smooth idle.

Only does it say 1 in every 5 starts. There is no pattern that I can find and ambient temperatures are all about the same.

Glow plugs all good.

Thanks

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1995 E300 Diesel

Most probably the last cylinder (no.6) has sunk its valves so much that the hydraulic lifter has run out of range. It happens on the OM606 only in NA form - its got something to do with the design of of the breather system - the last cylinder does not get its dose of oil vapor.

The other bit (which is good news sometimes) is that your fuel line O rings are wearing out and need to be replaced, they are causing minute air leaks which show up on starting.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Zulfiqar, thanks for that. I'd like to replace that somewhat 'over engineered' looking plastic breather system with copper someday. Every time I touch it something snaps off.

I've done my fuel line o'rings when I had an air in the line problem about 18 months ago but I probably should still check it.

Might have to look at changing the valve seats soon.

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1995 E300 Diesel

How many kilometers are on it?

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Jim

Are you sure you don't have a bad glow plug .... or an intermittant glow plug connection caused by damaged or bad wiring?

Engatwork, Just rolled over to 244,000 Km's today.

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1995 E300 Diesel

Hi dar2kmr2, new wiring harness approx 2 years ago.

I'm sure about the glow plugs operating as in they are getting power and drawing the correct amount of current to each, but, whether they [plugs] are glowing efficiently I don't know. I would have to pull them one at a time and glow them to see visually what is happening.

I do know that they are original and have never been replaced, so I could be up for some carbonizing fun to get them out.

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1995 E300 Diesel

My #6 is DOA. Is there a fix to keep it from happening again once I do the new valve job?

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Jay
Lifetime Member AA (Autoaholics Anonymous)

'93 500E (totaled 9/11 by a clueless idiot)
'01 CL55
'95 E300 Diesel
'90 Porsche Carrera 2(supercharged)
'03 Porsche Supercup
www.meangreentravel.com

Please elaborate on this where you express the "valves have "sunk" and Hydraulic lifter has run out of range." What is "dose of oil vapor".
Similar symptoms began in my 1995 E300D at 237,000mi. Removed intake header and discovered no.6 valve does not operate for 15-30 seconds dependent on ambient cold temperatures 40 degrees and lower.
I was surmising no.6 had a weakened or broken valve spring. What is remedy for sunk valve?
Thank you

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'96 C220 138,000mi, '95 E300D 239,000 mi., '87 300TD 214,000mi '88 6.2 Turbo Diesel Chevy Conversion Van 253,000 mi.

the valve heads seat on valve seats which can wear out - this process is accelerated if the oil vapor from the intake breather is removed from the system - in the NA OM606 engine, the last cylinder gets the least amount of oil vapor.

The hydraulic lifter running out of range is best explained by.

If you have an older engine with flat rocker tappets that are adjusted by screws (like the old 616 and 617 engines) you have to adjust them (loosen them up) every 15,000 miles. The valves actually sit a bit higher as the valve seats have recessed or the valve head is wearing thin.

In the modern 60x engines the lifter is hydraulic and self adjusts the clearance (that is why you dont have to fiddle with it every now and then), When the entire adjustment range is used up the valve head/poppet can no longer seal on the seat and this causes compression loss (bucking - running on 1 less cylinder etc)

best is a compression and leakdown test to judge whats wrong with your engine, A real bad sign confirming the need for head work would be if exhaust is blowing back into the intake from a cylinder.

High mileage reports of NA OM606 have had instances of the last cylinder intake valves and seats requiring renewal.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)