How is the oil pump removed from a 617 engine? It looks like removing the bolts would let it drop down except for the driving chain.

Can the pump be removed without splitting the chain?

P E H

PEH,

I have never done this but looking at the manual drawings, the chain drives a helical gear that engages the oil pump drive shaft mating helical gear, all about two inches or so below the large bolt head sticking out on the driver's side of the block, at the head/block parting line. The drive shaft is vertical or nearly so and is split. The drive mechanism pulls out the top, while it seems the pump and its drive shaft extension (driven by a mechanical joint that looks like an exagerated regular screwdriver tang on the pump end that fits into a deep slot in the drive end) are pulled out the bottom, once you remove the pump housing gears. The chain stays engaged in the pump drive sprocket and the rest of the chain sprockets.

I do not see any reason to think the chain or its timing is affected by this operation as the oil pump should care less if the drive gear is 180 out or not and the same is true for the helical gear.

If you need a better description I can try scanning the images and posting them, as well as the instructions for removing the drive mechanism from the top. There is no discussion of replacing or repairing the pump itself in my manual. But as I said, the chain driven helical gear engages the mechanism that drives the pump shaft, which is pulled out the top without any affect on the chain. Then the shaft extension from the pump up to the drive mechanism is free to be pulled without the chain being affected at all. Hope this helps, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)

NO!! Don't split the t-chain!! Remove the oil pan (lower pan), And there are two bolts holding the pump in, I can't remember the head sizes, I believe 13mm, One is visible imedieatly, the other is way up next to the pump drive. You will need an extension to get to it. Once those two bolts are removed, just pull out the pump.

Its just that easy!

Turbo oil pump is chain driven, non-turbo pump is shaft driven off the injection timer hub. I don't know if you can remove the non-turbo oil pump in the car, I don't think you can reach one bolt, but I've never tried, so may be wrong.

The gear on the turbo pump is keyed, make sure you don't lose that little woodruff key! There is also a spring drive tensioner on the chain.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

You are correct on the turbo oil pump, but he said 617 engine which is the non-turbo. You are right the bolt is way up there, but you can remove the pump from the engine with it in the car. Once you get the steel oil pan off, its right there.

Just adding my 2 cents!

Maybe I got the numbers wrong, I meant the 300SD (turbo)which I thought was the 617 engine. Anyway, I can see how the pump comes out except for it not being able to be dropped down because of the chain (not the timing chain) that drives it.

P E H

Why would u be replacing the oil pump? I was going to do that but told not to bec waste of $$ "they never go up."

The 617.951 is the 5 cyl turbo for SD's
The 617.952 is the 5 cyl turbo for D's

As far as I know, the difference between the two is the location of the engine mounts. I could be wrong though.

-Larry

__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

The manual says to remove the hardware holding the sprocket and remove the sprocket useing two screwdrivers, basically prying the sprocket from the shaft, which leaves the pump drive chain in place.

The turbo engine has oil jets that spray engine oil on the bottom of the pistons, the chain drive oil pump, and some other internal differences. The blocks are not interchangeable, probably why the mounts are different (to help keep folk from slapping a turbo on a non-turbo block and killing it!).

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!

Tx Bill: Good point. I thought when oil pumps go up, they just stop and your engine freezes up immediately thereafter. I guess it could happen both ways though..I wonder what's the likelyhood of either scenario.?

RSH,

Your answer sounds the best. When I looked at the pump, I thought that removing the drive sprocket was the way to go but I wanted to make sure. Since that is what the manual says, now I am sure.

Thanks RSH.

P E H