IP shaft seal

[asavage]

Complete Pump Assembly Tutorial with Pictures (Now English)

I've finally gotten a chance to read that page, and it's very good.

[Carimbo]

Yes but don't look too closely at the pics or you will see corrosion on the IP innards and dirty tools putting it together! Shouldn't this be done under clean room conditions?

[asavage]

Yeah, it looks like a poor core candidate for the rebuild.

[shark]

Any one have one of the viton shaft seals you can part with?

Any kits out there that have the viton parts?

[glenlloyd]

Any one have one of the viton shaft seals you can part with?

Any kits out there that have the viton parts?

Maybe it's time to do another order?

sa

[asavage]

Beware the "viton reseal kit" for the VE pump. In most cases, there is NO reliable way to ensure that what you're getting is really viton.

Aaron, I have a spare that I don't need immediately, if'n you don't want to order them directly, or if there isn't sufficient demand for a full order.

[asavage]

Do I need to wory about the composition of the other seals I am replacing in the IP?

This is a good question. Since the other VE IPs leak commonly at the accelerator shaft seal, that one will be the next to go. On the LD28, it's hard to replace that one with the IP in the car, but since you have it out, that one and the top cover seal would the the only ones I'd worry about.

See upthread the "lite" IP parts breakdown for a 4-cyl version of the IP:


From what I hear, the cover gasket (really a neoprene seal with a roundish cross-section) is a culprit, No. 67/65. Also the accel shaft seal, which is hard to determine on that pic but is probably either 325 or 329.

Another illustration isn't much better.


Pretty much anything labelled "o-ring" should be replaced if disassembled, but the critical ones are shaft seals, like the manual advancer shaft seal, 39/3 (which the LD engine doesn't have).

Do they need to be viton for biodiesel?

Yup. For B100 esp. Lower concentrations soften neoprene more slowly.

[asavage]

. . . the critical ones are shaft seals, like the manual advancer shaft seal, 39/3 (which the LD engine doesn't have).

What was I thinking? The picture of the LD28 IP above is the generic assy; the one used in the diesel Maximas does have a manual advancer with external control; the control is activated by the "cold start device" (CSD), a thermostatic wax-pellet arrangement bolted to the exteriour of the IP. The CSD linkage both advances the base timing and props the idle speed.

Sorry, I just forgot, and was looking at the picture above! Here's FSM 1982 pg EM-25 fragment:


One of my brand-new 1982 IPs (pic taken by seller, a couple of years ago). Note that the CSD changed for 1983; this is the '81-82 version:

[glenlloyd]

I wonder if the manual advancer can be extracted and replaced with a cover? Any ideas? I'm thinking my VW Golf here....

SA

[asavage]

Hmmm. Probably not easily. While the part does exist, you have to have the internal shuttle piston that matches. I think.

What should be do-able is to seal the advancer shaft hole with something more permanent. But by the time you've done that, you could just throw a viton o-ring at it and be done with it forever; why bother modifying the cover?

[glenlloyd]

why bother modifying the cover?

because I have seen no use for this feature and I have a junk pump without the advancer...so I was thinking of extracting it and sealing up the hole. Doesn't really matter, no matter what I have to pull the pump.

sa

[Midnightz]

My 83 sedan is apparently leaking at the IP, a quick glance at the 83 Wagon, its IP looks just the same (coated with fuel/grime). I am looking for three of the shaft seals. Would anyone be interested in another order?

Besides this thread, is there a step-by-step on rebuilding the LD28's IP and a list of seals, tools required? Can I follow the how-to from the VWDiesel's site?

TIA

[asavage]

My 83 sedan is apparently leaking at the IP, a quick glance at the 83 Wagon, its IP looks just the same (coated with fuel/grime). I am looking for three of the shaft seals. Would anyone be interested in another order?

I've got all the shaft seals I can use at the moment.

Besides this thread, is there a step-by-step on rebuilding the LD28's IP and a list of seals, tools required?

The best I expect one can do is to reseal the IP, not rebuild it. Rebuilding requires specialized calibration equipment that noone outside of a Bosch liscensed injection shop has.

Resealing the distributor head, the shaft seal, the top cover seal, should all be straightforward, once you actually get the IP off the engine. Timing it when reinstalling isn't much fun though. There is a thread on that.

[goglio704]

My 83 sedan is apparently leaking at the IP, a quick glance at the 83 Wagon, its IP looks just the same (coated with fuel/grime). I am looking for three of the shaft seals. Would anyone be interested in another order?

TIA

If you can wait until the coming weekend, I'll be home and can look to see what I have left from the original order. I'm pretty sure I can spare one or two of the shaft seals.

[odie]

I guess I'll be needing IP seals too. My IP has been leaking. Still trying to 100% locate the source. But probably the shaft....