I made a block-off plate for the OMP on my '88 TII - going premix.



I looks like the pump keeps the shaft pushed back into

the front cover about 10mm (roughly). That shaft looks like

it runs on a helical gear. It appears that the offset of the gears

pushes the shaft outward - toward the new block-off plate

that means two things: 1) the block-off plate has a rotating

shaft bearing on it (not much force, but some), and 2) the

helical gears are no longer aligned properly.



Anyone see any issues with either of those? It looks like

others' (k2rd) block-off plates do not address the drive shaft...



Just wondering...



Steve C.

Thats a damn good question. I wondered that myself so I took the OMP shaft out https://www.nopistons.com/forums/pub...#>/biggrin.png I wonder if that was a good idea? https://www.nopistons.com/forums/pub...IR#>/dunno.gif Hope so. Didn't look like it would cause any problems with it out.

Next time when you have the engine apart take of the gear on the shaft. Since you took off the pump no more oil will feed. But the shaft will move back and forth.

I remove the shaft from my engines

also note there is a oil feed in the front housing to the front cover that goes to that shaft which provides the oil for the OMP and lubricates the shaft... if you just pull out the shaft the oil will just dump into the passage where the shaft was and leak down to the pan, if you have the front cover off you can tap the hole in the front housing and install a set screw to plug the passage and elminate this. It's just cleaner in my opinion to do it this way, the 'leak' is not significant though because the hole the oil goes through to that passage is tiny.



http://pengaru.com/~swivel/cars/rx-7...2/IMG_2087.JPG



you can see the hex socket set screw installed in the hole photographed above... I just put some red thread lock on the set screw and plugged it up... shaft & gear all gone, when I get the haltech I plan on removing the gear from the eccentric shaft and replacing it with a narrow collar along with removing the CAS and running a trigger wheel... less crap running off the eccentric shaft (less rotating mass)

I almost **** my pants when I saw that oil feed for the OMP because I just removed the shaft with out plugging that small oil feed that comes out of the front end plate. But then I took a look at a 13b that I had a part in the garage to find that the plate looks to have maybe a .070 opening for the oil to pass by. It looked like the oil that went to the OMP shaft just kind of splashed onto it anyways.

yeah, but it's enough oil to provide a thin oil film bearing on the omp shaft.



don't forget that hole is right off the high pressure oil passage...

True, but my way of thinking is if it was there stock I should probably be ok. But you're right if anyone decides not to run a omp and has the front cover off it's probably a good idea to plug that little hole while you can. I kinda wish I did but I'm not sure it's worth taking my engine back out and doing it.

how about just filling up that hole with epoxy? Will it hold with 60-70 psi oil pressure?

it took a whole 5 minutes to tap and plug that hole, epoxy might work but i'm not sure how epoxy reacts with fuel and oil that might get to it at that hole, and if the epoxy breaks down somehow you'd have some epoxy getting into your oil sump?



this is just to save having to use a small tap and a set screw like it's difficult or something? I'd probably leave the hole alone rather than plugging it with epoxy, just my opinion though.