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Recently got an '82 300d turbo diesel, and while trouble shooting the shake it has at idle, the mechanic and I discovered there are tiny metal shavings coming from the fuel injection pump. We isolated it to the pump by checking the fuel right up to the pump (it's crystal clean) then the fuel right after the pump before it goes into the injectors. FYI Just did a diesel purge and replaced the fuel filters as well.
my questions for you folks are:
1) any tips on getting a good used fuel injection pump? Found some good deals on eBay with 30 day returns if it's not good.
2) I'm going to replace the fuel injectors as well since I'm sure that will resolve the shake while idle. I'm gonna go for ones with the Monark nozzles, any recs on the best place to get them?
3) anything else I should change while I'm doing this? The fuel hard lines, etc?
Thank you! And if you have any other tips please let me know!
PS. Just had a valve adjustment and replaced the motor mounts as well.
Without knowing exactly how you obtained that fuel sample its obvious that there is way too much contamination in that fuel sample and your description suggests an issue in the injection pump; however, it may be normal to see very slight amounts of very fine metal in the top of the delivery valve holder right after removing the steel line from it and in the top of the injector. If you carefully blow out the valve holder with compressed air and then crank the engine over with a clean white paper towel covering the valve holders, does the metal keep forming? If it does then there probably is something coming apart inside the pump. Some times the easiest way to check this is to remove the rubber plug from the last injector and put a hose on it and collect some return fuel in a clean container for analysis, you can also do this with the engine off by pumping the hand pump. Regardless of what you find I would suggest that you perform a compression test on that engine before you start buying any parts.
Without knowing exactly how you obtained that fuel sample its obvious that there is way too much contamination in that fuel sample and your description suggests an issue in the injection pump; however, it may be normal to see very slight amounts of very fine metal in the top of the delivery valve holder right after removing the steel line from it and in the top of the injector. If you carefully blow out the valve holder with compressed air and then crank the engine over with a clean white paper towel covering the valve holders, does the metal keep forming? If it does then there probably is something coming apart inside the pump. Some times the easiest way to check this is to remove the rubber plug from the last injector and put a hose on it and collect some return fuel in a clean container for analysis, you can also do this with the engine off by pumping the hand pump. Regardless of what you find I would suggest that you perform a compression test on that engine before you start buying any parts.
Thanks for the reply. Good call on the compression test. I went ahead and had one done and sure enough it wasn't good. The third cylinder tested at 190.
At at this point, with the shavings in the fuel and the poor compression, I'm gonna look into doing an engine swap (with the fuel injection pump attached).
if you have any further advice it would be appreciated. Thanks again!
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