No oil pressure after rear main seal changed

[HOWEY]

I,ve no oil pressure after doing a rear main seal and timing cover seal change, did everything methodically but on start up no oil pressure
Turned off engine, checked oil sensor connection, all good, restarted engine left her for no more than 30 secs and i heared a sound like woop woop coming from air filter, turned her off....
Im getting back pressure through the intake thats what the sound was not only that but my new antifreeze had foamed up to an extent in the top of the rad,i didnt let her run for more than 35 seconds, what the feck is going on????
Put new belts on her also.....

 

[indy4x4fab]

Unplug the fuel shot off silinoid from the top of the IP pump then do a comp test of each Cyclender, I'm thinking you have a blown head gasket.

 

[davidkroberts]

if your foaming then your getting some compression in your cooling system somewhere most likely... I think your head gasket has let go.

 

[HOWEY]

Unplug the fuel shot off silinoid from the top of the IP pump then do a comp test of each Cyclender, I'm thinking you have a blown head gasket.

But it didnt run for more than 35 seconds??

 

[indy4x4fab]

But it didnt run for more than 35 seconds??

Head gaskets don't always just blow, sometimes they can start out as a pin hole size leak and can be very hard to detect until the gasket give altogether. Doing a comp test will also rule out a blown head gasket which would cause the coolent level to drop on the compition side but if an oil passage had given way it would also cause the coolent to change to a muddy color and look.

 

[Stonepicker1]

If all was good with the engine before you started the repairs...I would say that when you dropped the oil pan and un-bolted the oil pump to replace the rear seal that something didn't go back together right.

On the timing cover...you had to remove the water pump...problem might be there on the re-install.

 

[HOWEY]

If all was good with the engine before you started the repairs...I would say that when you dropped the oil pan and un-bolted the oil pump to replace the rear seal that something didn't go back together right.

On the timing cover...you had to remove the water pump...problem might be there on the re-install.

Stonepicker im pretty sure the bottom end went together 100% i didnt replace the timing cover just the seal and balancer.
Would no oil pressure for 35 seconds blow a head gasket? Engine hardly got warm?

 

[Warthog]

See if you can rent or borrow a radiator pressure tester. It will help diagnose a blown head gasket.

You may also want to install a temporary oil pressure gauge to check the oil preassure.

Running for less that 30 seconds shouldn't hurt the head gaskets but may hurt the engine bearings.

 

[indy4x4fab]

Stonepicker im pretty sure the bottom end went together 100% i didnt replace the timing cover just the seal and balancer.
Would no oil pressure for 35 seconds blow a head gasket? Engine hardly got warm?

If parts are turning and moving and there's no oil flowing something is going to give sooner or later.

Question did you pull down on the oil screen by any small chance? If you did or u bumped it it may be sitting agents the bottom of the pan and causing the pump to not be able to suck enough oil threw the pump. I have seen this happen on SB Chevy engines before so this is just a thought.

 

[patracy]

I'm going to go with stonepicker1's idea. Did you reseat the vacuume pump to make sure everything aligned after R&R'ing the rear main bearing cap/oil pump?

Also, I wonder if there's the off chance that the engine spun up backwards like the multifuels can from time to time?

 

[Stonepicker1]

Something to think about.

6.2 No Oil PSI After Rear Main Replacement - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

[HOWEY]

I'm going to go with stonepicker1's idea. Did you reseat the vacuume pump to make sure everything aligned after R&R'ing the rear main bearing cap/oil pump?

Also, I wonder if there's the off chance that the engine spun up backwards like the multifuels can from time to time?

No, didnt reseat it, will take it off tomorrow and try to prime the pump with a drill, looks like a head gasket is gone from the compression coming from the air filter intake...... sweet jesus, starting to get disheartened now, one step forward and two steps back.....