No oil pressure [8BA]

There is an idler gear behind the flywheel that drives the oil pump off of the camshaft. I had a shop install the gear backwards so it was freewheeling. I was able to tell by pulling the oil pump out and looking up in there, I could only see half of the gear and I could spin it with a long screwdriver because it wasn't meshing with the cam. It's worth a look...
 
Check the gear on the back of the cam shaft. I had one come loose and no oil pressure. Had to pull the cam and have the gear drilled and a pin put in. Rare occurance but it does happen.
 
Here's the gear. I bet it was not installed. Easy to forget. 8BA cover is also made of stamped steel. 51 Merc cover (shown) is cast.
 

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I do not understand why you are trying to fix a problem with a new build. Take it back to the builder. You are voiding any warranty that you may have had.
 
with fuel pump off the gear is ok I tried to turn with screw drive no movement. Today I pulled the intake on left side clear down toward the back under the casting that goes to the oil pressure port on the outside I can see the top of a gear, either cam gear or idler. Is this right? ya have to almost side on you head to see down there!!! Now why I don't take it back to the builder, I did call him, nice guy. Earlier he had built me a different engine He put this together in 2015 for another guy. The fellow I bought it from. This had never been started, stored high and dry with assemble lube keeping it nice Told the shop of the oil problems he remembered this engine and said that from what he recall the whole deal was ok. I got the paper work that was with this rebuild showing all he had done and what new parts were installed, so that's the rest of that story. How about that hole??
 
Assembly lube dried up and blocking oil passages? Plug behind cam shaft gear missing? Crank clean out plugs missing? Sounds like you might have to tear it down and clean it. Mike
 
If you take the oilpressure sender out and fill it up with oil...then crank it with the port open you should see flow there even if there is a plug missing somewhere.
No flow the pump has to come out and be checked.
 
When this first started did the gauge thing both electric and mechanical. With the port open oil dribbled out. The more I think about the hole above the cam gears ..lube hole..If there is plug behind that gear that area seems to be where I'm getting to much flow when I play air games. I just wanted idea where the problem was. I've pretty much figured I'd have to drain every and pull it out. The more informed I could be ahead of that would be in my opinion would good. Engine tear down and assemble does bother me, just messy to start with.
 
I agree with chap52 take it back to the builder if he assembled it he’s the one who should stand behind it
 
Not much dissasemble to verify plug missing behind frontcover if the camgear is bolt on...a whole other headache with a press on gear.
Loosen front pulley tap it out a bit...unbolt front cover and camgear...should be able to do it in car.
 
OK pulled the front apart no plug behind the timing gear. I can't remember if there is a plug in the back. "flatheadmurre" gets the prize
 
nailbender said:
This on new rebuild, done at a shop.[this shop is OK done other work for me] Started with electric gauge checked with mech. no pressure. pulled the gauge only drips from the tube. Changed oil again, same. Pulled the pan and pump [looks new as the invoice said]. The engine fired right up and sounds good. With the pan off I can see assemble lube here and there. Put air up the pump hole via rubber stopper no bubbles from my oil pressure tube. Plain C maybe D. Any ideas where to look next, or how check things further.
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....take the engine back to the builder....with all ur doing to it the warranty may be void..
 
Thanks to all who replied to my problem , I've got a handle on this now. Nuts,bolts,gaskets and my time no big deal. Guess the shop owner had a brain fart, **** happens and life goes on. thanks again
 
banditomerc said:
....take the engine back to the builder....with all ur doing to it the warranty may be void..
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He can't go back to the builder as he bought it from someone else. The builder has no obligation to nailbender as the builder has no idea wheat may have happened to the motor by the first guy before nailbender bought it.
 
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