Engine/Transmission (1998.5 - 2002) Anyone ever have an oil leak at the vacuum pump or the power steering pump

[BTMaltby]

I have an oil leak on the drivers side behind the timing chain cover. I thought it was the crankcase vent so I reengineered that with a larger see thru catch container. It has leaked for years so I pressure washed the underside to help locate the leak. I am now certain it is from one of the following three possibilities: 1. Fuel pump seal - least likely 2. Vacuum pump seal at back of timing cover - likely 3. power steering pump to vacuum pump seal - likely. Most of the oil is located on 2&3. So my approach will be to replace those seals first to stop the leak.

Anyone done this and have some insights to offer.

 

[MARK JAQUITH]

Would say you need the vacumn pump rebuild kit from genos---that is where it usually leaks--My 2001.5 developed a leak back around 255000 miles so I pulled the ps and vac pump and did a rebuild--easy to do with great instructions. put all new hoses on ps flushed the system --now have 265700 on it and no leaks or problems..

Mark

 

[SAndreasen]

The genos reseal kit is the way to go . Pull both units off together and reseal and then reinstall

 

[BigPapa]

Anyone ever have an oil leak at the vacuum pump or the power steering pump

Yes, this is a very common issue. I resealed mine @350K ago and have had no issue since. I got mine from Gould Gear and Electric Inc. and used one of the spacer rings to move the sealing surface to a new area. I actually had to do it twice because I nicked the new seal on the drive collar dogs going back together. The dogs on the drive collar are VERY sharp.

I don't know about the 24V's, but on my 12V I removed the driver side battery and then removed the pumps together and if you rotate them just right they will lay perfectly in the battery tray with no need to remove the hoses.

Also, a word of caution. When bolting the two pumps together, make SURE you have the spacers in the right places. I have known more than one person (not me, knocking on the table...) that has broken the flange on the vacuum pump because they left a spacer out or put them in the wrong place.

 

[BDaugherty]

The advice to remove the vac pump and ps pump together , reseal both and reinstall is solid. It's much easierand less chance of messing up the dog clutch connection.

 

[Sticks]

I have an oil leak on the drivers side behind the timing chain cover. I thought it was the crankcase vent so I reengineered that with a larger see thru catch container. It has leaked for years so I pressure washed the underside to help locate the leak. I am now certain it is from one of the following three possibilities: 1. Fuel pump seal - least likely 2. Vacuum pump seal at back of timing cover - likely 3. power steering pump to vacuum pump seal - likely. Most of the oil is located on 2&3. So my approach will be to replace those seals first to stop the leak.

Anyone done this and have some insights to offer.

Just about everyone. Simple answer, and you have the solutions above.

Apparently new to the Cummins. Terminology corrections for you.

No timing chain, gears only. Timing gear cover.

The Fuel Pump is the Injection pump. The fuel pump (transfer pump) is located rearward at the base of the block.

Next point of common oil leak as the engine and seals get old is the push rod cover - which for some reason always seems to be right at cylinder #1 - leading you to think you have a injection pump leak, or vacuum pump leak...again.

The crank case breather will also lead to false oil leaks as the bottle drools down the front and collects along the pan and wraps back along the timing cover - in addition to coating the inside of the radiator around the perimeter with gunk.

 

[RichB59]

I had that leak on the vacum pump some years ago. I changed fluid to a syn. PS fluid and the leak stopped. Must be 10 yrs ago.


Rich