MPS, Rebuilding the MPS Options

[Ron914]

Hello to all who have helped me with this project . @emerygt350 ,@TJB/914, @Superhawk996 , @ChrisFoley , @rjames , @MDTerp
I am in the middle of rebuilding my MPS and have a couple of comments and questions .
First when I opened up the unit I found the most difficult job was removing the rivets holding the two halves together.
When I removed the retainer plate to take out the old diaphragm it was in two pieces .

I needed to take two measurements since I was replacing the stop screw , I needed to measure the the stop screw protrusion into the housing . The instruction sheet sent to me by a member had the measurements he must have made when rebuilding his MPS . His stop screw protrusion was 1.97mm and mine only measured 1.72mm.
His inner/outer screw assembly depth in the old diaphragm measured 6.51mm .
Here's one of my questions ?
when I measured mine I got two measurements depth to inner/outer screw assembly was 4.03
and depth to the washer outside the inner/outer screw assembly was 5.46mm.
Again there is a difference and since mine was never accessed before (epoxy over screw was not disturbed) is the difference in measurements ok and which measurement should I use I will try to attach a photo or two to help with my question.
this one .

I have not touched either of these measurements yet and awaiting any help/comments.
I think it's this one to the washer on diaphragm .

[Ron914]

I will try your suggestions later today and post the results . You can see my factory oil temp gauge in the photo of the vacuum and Dakota CHT , its has only moved a little bit , don't know if the 90F corresponds with the reading shown . I have an IR thermometer so I will also take a photo of my readings with it and the Dakota and factory temperature gauge.
Thanks

[emerygt350]

I will try your suggestions later today and post the results . You can see my factory oil temp gauge in the photo of the vacuum and Dakota CHT , its has only moved a little bit , don't know if the 90F corresponds with the reading shown . I have an IR thermometer so I will also take a photo of my readings with it and the Dakota and factory temperature gauge.
Thanks

Nice to see you are still poking at it. That oil will take forever to heat up, so nothing odd there.

Superhawk's suggestion is where I would definitely go. Easier than a pot. Definitely check the extra cht you have in boiling water. I would pull yours asap and boil that one too.

[Ron914]

I will try your suggestions later today and post the results . You can see my factory oil temp gauge in the photo of the vacuum and Dakota CHT , its has only moved a little bit , don't know if the 90F corresponds with the reading shown . I have an IR thermometer so I will also take a photo of my readings with it and the Dakota and factory temperature gauge.
Thanks

Nice to see you are still poking at it. That oil will take forever to heat up, so nothing odd there.

Superhawk's suggestion is where I would definitely go. Easier than a pot. Definitely check the extra cht you have in boiling water. I would pull yours asap and boil that one too.

I will need to make the custom 3" extension tool for removing /installing the CHT sensors but I will follow the easy suggestions first then go get a 13mm deep socket and test both sensors . I really can't say why everything went south after rebuilding the MPS but after many redone connections on the FI harness the car is improving .I had a lot going on this summer and really just needed to take a break from the car for a while . I had a great time at the WCR2025 and met a lot of great fellow 914ers . My new goal is to get running so I can take my 914 on the next local run with many I met at the ramble on 9-13