108 cdi engine problem - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 03-08-2013, 03:01 PM Thread Starter
BenzWorld Junior Member
Date registered: Mar 2013
Vehicle: 108 cdi Vito
Location: Tasmania, Australia
Posts: 16
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(Thread Starter)
108 cdi engine problem

Hi and thanks in advance for any help or advice.

I recently purchased a 108 cdi Vito van (made in 2000) that starts OK, idles rough, lacks power and produces lots of white smoke from the exhaust. Everything else about the van is ok and it was certainly cheap enough to take on as a project in the hope I might replace my current aging vehicle.

My first thought was a blown head gasket but investigations indicate that is not the problem. After removing the plastic head cover and mixing chamber I found cylinder #4 port was wet with diesel, which would indicate no combustion in #4. That would explain the diesel smelling white exhaust smoke and the other symptoms. I also noticed the injector on that cylinder looked cleaner or newer than the other three as though it had been recently changed and/or removed.

At this stage I thought it best to get some professional advice and had a diesel mechanic take a look at it. He attempted to remove #4 cylinder injector in order to do a compression test, but it was seized in and he was reluctant to get too rough with it in case it broke. His opinion, based on the sound of the engine, was that it was probably a compression issue and probably a valve.

So, it would seem the head may need reconditioning. As a project I'm keen to do the work myself wherever possible, out of interest and also to save money. I assume the head can not be removed without first removing the injectors? If so, the first hurdle is getting the injectors out as they seem siezed tight. It also seems that a smarter first step would be to do a compression test in order to rule out a faulty injector before pulling the head off.

The injectors seem quite clean and have no indication of leaking or of black deposits, they are just stuck tight.

Any advice with injector removal, ie tools or techniques would be greatly appreciated. Also any advice or opinions on engine diagnoses based on these symptoms would be likewise greatly appreciated. Thanks.
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