Pfc. Parts

I have a new LASO style pump I'm installing on my '85 and have a small problem. The new pump is missing a steel boss that covers a spindle on the water pump that the timing belt tension roller rides on. As a result, the belt tension roller won't mount to the pump.

Does anyone have a secret incantation I can use to remove the boss from the old pump and transfer it to the new one? It appears to be pressed on and there's no clearance to get a gear puller on it.

Thanks,

James Bailey

That boss sounds like a creative fix for a problem like an incorrect part....perhaps post a photo of the boss and your roller...

Pfc. Parts

Hey James -

I should have posted pictures to begin with, thought this might be a common problem recognizable by description only

Here are the pics.

#1 shows the boss on the original pump.

#2 shows the new pump, spindle only, no boss

#3 shows the tension roller assembly.

Suggestions & comments welcome.

Bilal928S4

That looks like a damaged pump.

James Bailey

Are you reusing the old roller because it looks like an 87-95 ? go to 928 Internationals site and look at the roller pictures...

Pfc. Parts

Which one? The one I took out was definitely damaged, it had both radial and axial play and was leaking like a sieve. The new pump (2nd picture) isn't damaged at all near as I can tell. I had put some grease on the spindle before I discovered the boss was missing. Sorry for the poor focus but I used a cheap camera w/o a macro focus and the pump is already installed on the engine (no distance available).

Pfc. Parts

I've never replaced the roller myself. Last service on the water pump wasn't done by me, it's possible the shop used the wrong part and "fixed" it with a boss on the pump?

Pfc. Parts

Here's a better photo of the new pump, sorry for the poor first attempt; the flash was turned off (it's my wife's camera, I should have checked).

What you see on the spindle is just moly grease. The point is it doesn't have the boss the old pump does.

James Bailey

I do not have the parts readily available to measure the difference between the 85-85 roller and the 87-95 but to my eye it looks like they "adapted an 87-95roller to fit an 85-86 pump with a steel sleeve. If you had an 85-86 roller it should fit the aluminum boss just fine. Call Tom at 928 International and ask him for measurements.....it may take a while as they are often busy but ALL the parts are there !!!!!

Pfc. Parts

Thanks James, that would explain the entire thing. I'll do that. The irony is I had an absolute b*tch kitty of a time getting the roller off the old pump. I think I now understand why.

Best Regards,

Pfc. Parts

One more point of irony in this story; I told Roger at 928sRus that I'd maybe screwed up the roller getting it off but didn't want to buy a $100 bearing. He advised me I might be able to polish out the roller that I'd damaged during the extraction, so I spent a day or so with 440 & 2000 wet paper polishing the thing to perfection.

Now I get to buy a new one anyway. Why does my butt hurt?

This is in no way meant to be any form of criticism at all with respect to Roger or 928sRus. I just want to let anyone reading this know that was an attempt at self-deprecating humor, nothing else. The universe continues to mystify me and my muse is a 928.

Pfc. Parts

Likely the final resolution, not certain yet since I haven't received the part but 928 Intl. confirms the part (928 105 571 02) has a bushing pressed into the standard INA 45x20 bearing that reduces the inner circumference to about 17mm.

In my example, the bushing froze to the aluminum spindle cast into the pump and didn't come off with the idler. Heating it with a torch didn't free it. The idler suffered some minor damage during extraction anyway, most of which was polished out, but I'm not going to make any more heroic attempts to save this part. With luck I'll have the replacement early next week.

Thanks all for the advice.