heres some pic's of the A12 Im playing with, got it to run briefly but no oil pressure. Pulled the pan & found all this, I know it'd been modded obviously but had never looked inside. Surprisingly clean inside & looks to be in decent cond. has approx 190 PSI 1 thru 4 cyl's.

I couldn't get any oil pressure from it though. Pulled the pan and found the pickup tube screen smashed all the way into the tube and it seemed to have a silicone goo plug stuck in the screen, cleaned that out, puul the screen back out & tried to bring up oil pressure by inserting the pickup into a bucket of oil & cranking the engine over (flywheel & started attached to block) still no oil flow.

Only thing I can think of is perhaps the welds on the pickup tube extension are leaking air, I put a new gasket inbetween the pickup & block...

curious what crank this is, cant find a reference to a H1040 crank, stamped on the journal...

Im planning on replacing the pickup & pan with stock 1200 ones then ck pressure. Any other reasons anyone can think of for no oil pressure? tried 3 pumps BTW...

weird problem.

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  crank1.jpg (80.64 KB)


  plugged pickup.jpg (109.75 KB)


  windage 1.jpg (198.61 KB)


  pickup plug.jpg (27.62 KB)


  extended pickup.jpg (63.07 KB)

more pic's

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  pickup on motor.jpg (59.15 KB)


  extended pan.jpg (71.28 KB)


  piston.jpg (76.05 KB)

H10 is the AMC for original B110

Quote:That's odd, it looks no deeper than a stock 1200 pan


If it is deeper, when installed it will be lower than the rest of the 1200 underbody clearance and the crossmember will no longer act as a skid plate. Surely a wider sump is the better way to expand capacity?

it's definitely deeper but doesn't really matter, I dont want it lower than the Xmember.Going back to stock.

more concerned with figuring out why no oil pressure, seems odd that I cant get the pressure to comeup even when pickup submerged in oil, just cranked w/filter & sending unit port open & nada comes out.

I like they're homemade windage tray, somebody back in the day was trying hard to mod this motor. I think this thing has flat top pistons with a slight recess into the edge for the spark plugs as well, haven't pulled the head yet, I was hoping to run it on the stand first

Does it have a Competition Oil Pump? Those are not self priming per Nismo




2nd type

nope, typical A series pump. i just now peeled back the screen & pressurized the pickup tube - finger over tube, air nozzle in other end - not an air leak in the tube welds...

you've stumped us. I was wondering if the oil pump drive gear was sheared off, but in an early A12, that gear also drives the distributor -- so just the fact that it starts indicates the gear is ok

I wondered about the connection to the cam as well, I looked up while hand cranking the engine & I see the pump gear meshing & turning with the cam.

Only thing I can think of is cranking motor over with starter only the RPM's aren't fast enough to pull up oil into the pump let alone build oil pressure, engine has to run to make pressure. I cant imagine starter RPM's are at 800ish, probably more like 200 or less which seems like it wouldn't pull oil up at that rate.

Just speculation, I dont know. Thought maybe one of the hotshot engine builders of down under would know - I'll ask Rob at Action Machine if thats a reasonable guess.

It really seemed like the silicone plug I pulled out of the pickup tube end was the obvious stoppage, it was woven into screen basically capping the pickup - 4th pic, 1st post - looks like hair ball but rubbery

silicone gets into all places, must be in other places for sure
would be causing drag even in the crank oil passages.