NAPA carries the die
 

;)

Jon242... I simply made a connection to my compressor to one of the breather hoses to the valve cover, put a bolt in the other breather hose (other valve cover), and blocked off the dipstick tube with a small piece of tubing and a bolt. Make sure you don't over pressure the crankcase!!! I used as little as I could while still getting a reading on the guage. I was shooting for 10-15psi. My motor was sitting on the shop floor with no flywheel, not in the boat, so I am unsure how successful it will be for you. If it is the holes I said you won't be able to see it with the flywheel on, but you'll damn sure hear it. Otherwise, maybe the mirror idea with a spray bottle of soapy water with work.

Good Luck,

BT :cool:

Your problem might me with the valve covers. The newer valve covers have the rubber oil ring in lieu of a traditional gasket. The valve cover has small flanges to prevent the o ring from being crushed. On some after market heads the landing isn't thick enough to catch the rubber o ring but does catch the flange, leaving a gap.

I just experienced this using 500 EFI valve covers on World product cast iron heads. After grinding the flanges down the problem went away.

Good luck!

I had the oil passage plug behind flywheel botton out & leak around plug. When I picked my motor up from engine builder they were chasing what they thought was bad main seals in 2 of the engines they build. They were putting motor on dyno & oil was leaking out at back of pan. After I got my motor in boat had same leak they were chasing. I pulled the motor, pulled flywheel, pulled distributer & installed oil primer. As soon as I pressurized oil saw small leak from there. Bought a new plug & fixed leak.

This last year had motor redone after detonating by another engine shop. When I pickked up I asked if they had check plug in back. I did not check & now I have a small oill leak coming from the back of engine again. I am just going to wait until season is over before pulling motor to check & see if leaking from same spot again.