worst case senario

[NYTurbo]

Also if going new I forget but either Yamaha or cat when we checked was cheaper than one another

 

[Turboflash]

thats not good! my first step is finding the correct adapter to verify the leak, once verified, a new possibility cracked casting from ysmaha? or just get a used complete head? are their torque specs on thise plugs? mesning remove em ,reseal em and properly torque em in used or new?

The plugs don't leak. The issue is whatever torque is used to install them must be too high. It cracks the boss around the plug.
If it was me, my design would use a plug with straight threads and a plug with a nice high-temp silicone oring. The outward force on the aluminum boss in the head as the pipe plug is screwed in is sometimes too much for strength of the boss, so it cracks. Nfg.

 

[HABS 1]

The plugs don't leak. The issue is whatever torque is used to install them must be too high. It cracks the boss around the plug.
If it was me, my design would use a plug with straight threads and a plug with a nice high-temp silicone oring. The outward force on the aluminum boss in the head as the pipe plug is screwed in is sometimes too much for strength of the boss, so it cracks. Nfg.

correct, the plugs being npt are tapered n crack the boss, wondering on a new casting.. remove the plugs, reseal woth pipe dope or whatever and torque the plugs in place with a possible lighter torque, so after some heat cycles it dont crak again? just a thoght

 

[HABS 1]

just a bit of an update..so i took a oil sample n sent if off.. results were high levels of coolant.. action required! the system is 16lb.. i have 18 lbs in it.. cant see any coolent or crack around those bungs... sprayed with soapy water , no bubbles... mabe its cracked sumplace else? either way im takin it off to inspect and stud it.. i just cant see it being a gasket bc it didnt pressurize system it lost coolent.. anyway i will update again but will be a while

 

[connor wilson]

did you end up testing the oil cooler? probably worth doing that before yanking the head i would think. what adaptor did you end up getting for the pressure test?

 

[Turboflash]

did you end up testing the oil cooler? probably worth doing that before yanking the head i would think. what adaptor did you end up getting for the pressure test?

Oil pressure is about 60-70 most of the time. Cooling system is 15 lbs. If oil cooler fails, you'll have oil in coolant, not coolant in oil.

 

[Fords4life]

Could get coolant into oil cooler after engine shut down, no oil presure at shut down but presure still present from hot engine making coolant presure.

 

[connor wilson]

Oil pressure is about 60-70 most of the time. Cooling system is 15 lbs. If oil cooler fails, you'll have oil in coolant, not coolant in oil.

ahh right makes sense

 

[Srxspec]

Your pressure test may not show bad at room temp, engine temp of 165+ will cause aluminum to expand and could be opening up crack.

 

[Srxspec]

Pressurize it more, 24 psi.

 

[Turboflash]

Could get coolant into oil cooler after engine shut down, no oil presure at shut down but presure still present from hot engine making coolant presure.

Maybe, but if there's a breech, there would still be oil forced into cooling while engine is running, prior to shut down.

 

[Fords4life]

Maybe, but if there's a breech, there would still be oil forced into cooling while engine is running, prior to shut down.

You are correct while running oil will overcome the coolant presure.

 

[HABS 1]

figured id test it out, at lest i could clean the oil oil out real well ! ... wasnt leaking

 

[HABS 1]

did you end up testing the oil cooler? probably worth doing that before yanking the head i would think. what adaptor did you end up getting for the pressure test?

i got a china kit off amizon, gives u a huge assortment of caps n stuff.. was like 80 bucks, its cheap but worked, i have a good stant one but nothing to adapt to the sled

 

[HABS 1]

Pressurize it more, 24 psi.

i will when i get back to it... and will post here to update.. im thinking now i have the coolent mostly drained from the sled , put 24 psi of air pressure in system... and spray those pipe plug bungs with soap