New engine installation

[BTate]

Just finished installing a new 5.7 engine in my 4winns. Almost ready to fire it up. Turned the key to get everything moving and I noticed an oil leak coming from an open bolt hole right above the oil filter. I obviously left something off but can not remember if a sensor or something mounted there or if it was just a bolt to plug the hole. Can one of you give a guidance on this. Thanks

 

[Lou C]

Some engines have an oil pressure switch to turn on the electric fuel pump after starting that goes there. I don't think that VP wires it that way but for sure that hole has to be plugged. The right size plug will work but you need to find out the size and type of threads (straight thread or NPT) I'm guessing NPT threads. Good thing you caught that, you would have lost oil pressure pretty quickly! If you can't find the correct pipe plug you could install the sender that Merc uses just to seal the hole....

 

[Scott Danforth]

Oil pressure port.

 

[flashback]

Are there any threads left in it?

 

[cyclops222]

Call the engine company !! Warranty ?

Look at the space between the 2 holes !!! there is a sMASHED IN area. Do not run the engine!!! Call the company about the crushed in metal area.

 

[Lou C]

Something odd there, the upper hole seems threaded but the lower hole does not and what’s that odd looking gouge/casting flaw to the right of the lower hole?

 

[BTate]

Some engines have an oil pressure switch to turn on the electric fuel pump after starting that goes there. I don't think that VP wires it that way but for sure that hole has to be plugged. The right size plug will work but you need to find out the size and type of threads (straight thread or NPT) I'm guessing NPT threads. Good thing you caught that, you would have lost oil pressure pretty quickly! If you can't find the correct pipe plug you could install the sender that Merc uses just to seal the hole....

I had my original engine rebuilt. I figure it was just a plug the shop didn’t replace after they stripped the block down. Had a couple other plugs that were not replaced that I caught during assembly.

 

[Lou C]

I’d show that photo to the shop that did the work….

 

[Scott Danforth]

that should be a threaded port. it will come with an oil galley plug or a pressure switch.

 

[BTate]

Oil pressure port.

Oil appears to be coming from the bottom hole. Top looks like a place to bolt an accessory. Hard to get a clear look.

 

[Lou C]

I looked at a pic of a reman 5.7 Vortec on Michigan Motorz's site and it has the upper hole empty but the lower hole has a pipe plug in it with a hex...

 

[Scott Danforth]

Oil appears to be coming from the bottom hole. Top looks like a place to bolt an accessory. Hard to get a clear look.

whats to look at? the open port with the damaged threads is an oil port. and yes, the top threaded boss is the clutch Z-bracket mounting point

 

[Lou C]

I wonder if the shop buggerd the threads removing that plug?

 

[Bondo]

I wonder if the shop buggerd the threads removing that plug?

Ayuh,..... Donno, but I would just run a pipe tap in to clean it up, 'n the run in a pipe plug, or sensor, with abit of perfect seal on it,.....
Just don't run the tap in to deep,.... clean the threads, don't cut fresh threads,....

 

[Scott06]

Oil appears to be coming from the bottom hole. Top looks like a place to bolt an accessory. Hard to get a clear look.

Top hole is not used. Bottom hole goes into oil pressure gallery. On my mercruiser this has a T for the oil pressure switch and the oil pressure sender. I think it’s 1/8” npt, if not that it’s 1/4”npt. If you don’t have any senders or switches to go in just plug it with a pipe plug