Hi folks,

I am about to change the glow plugs on my car. I will need to take off the intake manifold and love to clean out the dirt. Which gaskets, o rings etc, do I need ? Thanks. Please help.

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1992 300SD, 290K miles.

At least an intake manifold gasket and the gasket for the intake manifold end of the crossover pipe. The green o-rings on the mixing pipe end of the crossover pipe are usually good even after lots of miles.

If the IP is leaking oil from the shut-off valve, get an o-ring for the shut-off valve or just replace the shut-off valve.

Some folks can replace the glow plugs without removing the manifold.

Sixto
95 S420
87 300SDL

http://www.***************/catalog/lookup_parts.cfm?SubcategoryID=5424&VehicleID=1194050&CFID=487724&CFToken=90289973

Which of these is the correct one ?

Also, what is the gasket on the cross over pipe called ? Thanks

__________________
1992 300SD, 290K miles.

Go ahead and get both gaskets. Looking at the link, the top one goes where the intake manifold meets the cylinder head, and the bottom one goes where the crossover pipe meets the intake manifold. Not sure which gasket on the crossover pipe you're speaking of, but the only other one is the green O-ring that Sixto mentioned.

OK great. Thanks very much, everyone. I meant to say the Green O-ring that sixto mentioned. My bro in law also said it's not neccessary.

__________________
1992 300SD, 290K miles.

Hi Folks,

There is a black layer of oil inside the intake manifold, in the cross-over pipe, and where it's going into the turbo. Do you recommend that I clean it ? Should I ? How do I clean this ? Because there is not really a good clearance to the intake manifold to clean. If I clean half-a**ly, something might fall out later.

Thanks for the help.

__________________
1992 300SD, 290K miles.

Is it oily or is there a considerable amount of build-up? You have to remove the intake manifold to clean it. I'd advise that you take it to a machine shop to get it cleaned because it takes some nasty cleaners to remove the build-up. I haven't heard of anyone who noticed a performance improvement from cleaning the intake manifold.

One hypothesis on the rod bending problem of the 3.5 is that chunks of build-up get sucked into the combustion chamber.

Sixto
95 S420
87 300SDL

I looks like a thin layer, but I think it's thicker than it looks. I've just read that Soaking in Biodiesel will dissolve everything.

__________________
1992 300SD, 290K miles.

Makes you wonder what it does to rubber fuel lines and IP seals

If you have to pull the manifold to replace the glow plugs then consider having it cleaned. I wouldn't pull the manifold just to clean it.

Sixto
95 S420
87 300SDL