According to the parts fische there is one part number for the turbo and one for the non turbo car. Even the FSM gives two different values for the amount of oil discharged by the two.

So since there is no part number on the pumps, does anybody have a clue how to tell one from the other without measuring the discharge amount out of each?

 

Problem resolved. Did a search on the forum and read the online, free fsm. I shoulda known. Thanks.

 

Geeez, we missed a golden opportunity there. "SEARCH-READ THE FSM".

 

Sorry....I was just jerking everyones chain. It (the answer), isn't in the FSM and DEFINETLY not in/on this forum or that other forum and I doubt anybody that's on or has ever been on this forum has a clue b/t the Turbo vs the Non Turbo metering pumps identity.

 

I had assumed you just used the higher cotter pin hole in the linkage rod on the S4 turbo.

 

NO. The PUMPS have different part numbers in the parts fische.

So I assume that they are/were made different internally if not externally. Keep in mind that when we assume we need to remember the old saw ***.....U......ME ( As in make a *** out of you and me when we assume).

 

Some assumptions are riskier than others.
I have never tried to cobble together S4/S5 turbo/non-turbo parts.

At least, with an S4, when in doubt you can block off & pre-mix.

When my S5 MOP fails - I'm screwed.

 

So clue us in on your new proprietary knowledge. What is the difference and why?

 

Is the amount of oil discharged due to the actual physical unit or rather the ECU (TII or NA)? I believe I have both an NA and turbo S5 OMP sitting around if there is a p/n or serial number you want me to check when I get home tonight.

 

He already said - the flow rate is different.

What we're after is a visual inspection clue for the S4 MOP's.

 

[hijack]

I am courious about the S5 MOP's. IE: when my MOP fails, will the S5 NA MOP work as a replacement.

[/hijack]

 

Assuming NA and TII s5 front covers are the same and the resistance tests in the FSM are the same for both I would ASSUME so but I'm too lazy to actually check. So if someone who isnt so lazy wants to check. The only thing you would need to change is the OMP lines *theoretically* right?

 

Series four are purely mechanical. The series five are electric.

On a series four, whether turbo or non turbo, you check the flow rate at 2000 rpm with the pumps arm full up. There are different results for the tubo vs the non turbo.

I've a clue after taking four series four apart and two first generation. But it's not conclusive til I take the pump off my 86 non turbo. The *piston* on the end of the pump opposite from the lever end, has a smaller diameter shaft on the non turbo vs the turbo.

I'm mostly stumped because I'd bought a front cover for a turbo engine off this forum, and when I looked at its pumps *piston*, it was a smaller diameter than the other pumps I took apart.

The larger diameter *piston* pumps seem to meet the requirements of the FSM. My 86 was rebuilt before I had any turbo engines, so I like to think its pump is original.

I used the word *piston* because I've no breakdown of the parts of the pump and there is NONE online.