Replacing "81, 300D IP - PeachParts Mercedes-Benz Forum

#1 01-22-2003, 11:05 AM

I expect to get started on the replacement of the IP in my daughters '81 300D in a few weeks.

I know that the oil filter housing has to come off to R&R the IP. I expect this to be a real pain, but the question is, will I have to raise the engine to access the oil filter housing?

What obstacles should I expect?

I expect that after finishing this job, I will have some more "belly ache" posts regarding the difficulty of service on the five cylinder as compared to the four cylinder.

Thanks for your help,

jhal · #2 01-22-2003, 11:28 AM

Hi, I have done several Injection Pump replacements on 123 diesels both 4 and 5 cylindar and have never had to remove the oil filter housing to remove or install the pump. It is a tight area to work in, but it can be done without removing the oil filter housing. Let us know if you have any more questions regarding this repair- John.

#3 02-08-2003, 01:54 PM

I got started on replacing the IP this morning, but chickened out because it was just too blasted cold in the shop. It was freezing weather and when you pick up a wrench it instantly sucks the heat out of your hand.

Anyway, the pump is almost ready to come out, but it looks as if the bracket at the lower rear of the pump will be a problem without removing the oil filter housing.

If I take the two bolts out that hold this bracket to the block, will the rear of the pump swing away from the motor far enough to move it back and out without removing the oil filter housing. It doesn't look like it will, but I would like to hear from someone who has done this recently enough to remember.

If I must remove the oil filter housing it LOOKS like it won't be too tough.

Your experiences and comments would be appreciated.

Have a great day,

Stevo · #4 02-08-2003, 03:53 PM

Larry

The first thing you should do is go find a wood stove for your shop.... Burrrr

engatwork · #5 02-08-2003, 07:44 PM

LOL - I've got an engine hanging on a hoist in the garage another day because it ain't quite warm enough

. The wife is ready for it to be out of the garage.

Can't you just take the bracket off and then the injection pump.

mplafleur · #6 02-09-2003, 10:39 AM

Too cold in Texas? How cold can it be?

Although I was in Dallas during Christmas '73 or '74 when it snowed an inch or so. The whole city came to a standstill.

MBJOE · #7 02-09-2003, 06:41 PM

Larry, The two bolts in the bracket have to come out along with the one in the same bracket that bolts into the injection pump. I have done this many times on 4 and 5 cylinder MB diesels. The 240D is not that hard if you have a small hand to get the injection pump bolt back in. I usually call my 13 year old to come and get it started since his hand is half the size of mine. The 300D is a little tougher but it is still possible with a little patience. I have heard and read stories on this board about taking the oil filter houing off th get the injection pump off and I always wondered why they went to that extra trouble to get the IP off.

MBJOE

#8 02-10-2003, 07:08 AM

I knew that there would be a comment about being cold in Texas.

It was 32 in the shop on Saturday. 32 degrees is 32 degrees whether it's Texas or Alaska.

Yes, I realize the bolts that need to come out. The challenge is the one that holds that bracket to the pump. It looks very near impossible to me. I have gotten a wrench on it and loosened it, and I expect I can get the bolt out, but going back together looks like a real challenge. Maybe if the bracket is snugged in place on the block, then somehow the bolt could find its way into place.

I'm at the point of getting that bolt out or the oil filter housing off and I will have the pump out. It was due an oil change anyway, so the oil is now draining while I go to North Carolina for most of the week. When I get back, maybe it will be a little warmer and I can finish the job one way or another.

Thanks for the comments,

mplafleur · #9 02-10-2003, 08:57 AM

Sorry, I had to get my dig in.

32 is a balmy day here, where I can get my outside work done. I suppose though that when I quit the north in years to come and move down south to warmer climate, I will become acclamated to the local weather as well. I will find myself someday staying inside because it is too cold to work on the car. It will happen.

But, will I ever get used to the hot? I don't like it much more than 80 degrees outside.

#10 02-10-2003, 04:59 PM

Well, then you sure won't like July, August and most of September. It is always well into the nineties with humidity and most days will be over 100, with 110 or 112 not being out of the question.

At least when it's hot, the wrenches don't suck the heat out of your hand. Of course, you can't hold onto them for the sweat.

Have a great day,