BENZ AID - COMMON QUESTIONS AND ANSWERS

Remove marine bulb style hand pump?

Installed the auxillary fuel pump and it works greats. My question: I also have a marine style bulb hand pump installed, when I bypassed the stock hand primer pump last year. Should I remove it? Can it handle the pressure the auxillary pump produces? The bulb pump seems pretty plump but it's holding, no leaks. Will it eventually burst or can I just leave it alone for now? I'm planning on a 700 mile road trip next weekend and would like to wait to replace it if I can. I've ran about 150 miles since I've installed the auxillary fuel pump and no problems. Thanks, Keith

Chassis Model Number

W115

Forums

SVO Fuel Conversion Specific Aid

'87 300DT with coolant, oil pressure, and fuel guage malfunction

Hi: I have an '87 300DT with the 124 chassis. Has been running fine. The problem: the gauges for the coolant, oil pressure, and fuel all dropped to zero. The combination relay (part 201 821 00 47) is vibrating and making noise. Replaced the relay with the identical part with no improvement. Fuses are all good. I am about to test the sender units for the above guages. Any ideas? Thanks much, Pat

Forums

Diesel Engine Specific Aid

Taxonomy upgrade extras

Questions and Answers

Chassis Model Number

W124

240 warm up loss of power

My 1982 240 D will loose power shortly after warming up, particularly noticable when attempting to accelerate or go uphill. During these times I can manually downshift the automatic transmission and the engine speed does not respond. Once I crest the hill and reach 45 miles per hour there is a sudden surge in power. I have changed all filters, and two different diesel mechanics in our area cannot figure it out. The car is a wvo conversion, and the same phenomenon occurs wether on diesel or veg. On a cold morning or when the car is first started this does not occur. Any suggestions?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

Stripped valve locking nut 1983 300D - Now what???

Hi all; Was doing my first valve adjustment and am convinced that the #6 valve has a stripped lock nut. I'm concerned that the valve stem itself is stripped, but when I tighten down the top (adjusting) nut, the locking nut just glides with it, and I CAN get a ton of clearance for the rocker arm. What's involved in changing the locking nuts? Do you have to remove the cam, etc? I know that either (or both) the threaded valve stem or the nuts can strip. Typically, does the nut give out first? Hoping to hear that I don't need to pull the cylinder head.

Forums

Diesel Engine Specific Aid

Sporadic oil pressure needle

!985 300CTD;150,000miles. During a 7 hr trip at highway speed the oil pressure indicator needle stays at a constant "3". When reducing speed & coming to a stop or idling the needle bounces (is not steady) at just under "2" & a "thumping/knocking" sound comes from the gauge area but is not heard when the engine rev's up. The engine runs quite well & pulls strong. The oil/filter was just changed & I have used synthetic diesel 15w-40 in the vehicle for the past two oil changes@5000 miles per.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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