The Ford Barn - View Single Post

40 Deluxe · 06-05-2019, 03:35 PM

Quite possibly a head gasket weeping coolant into a back cylinder then leaking down past the rings and collecting on the cap bolt. I don't see evidence of an external leak, and if there were, how could it get inside the crankcase?
If you have an Autozone or OReilly's near you, borrow a leak detector, put the dye in the radiator and spin the water pump with a drill to circulate the dye (remove T-stat if needed). Wait awhile, then do the procedure. If it's a head gasket, may take a few days.

06-05-2019, 03:35 PM	#7
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: 56 312 Coolant residue on rear main cap. Quite possibly a head gasket weeping coolant into a back cylinder then leaking down past the rings and collecting on the cap bolt. I don't see evidence of an external leak, and if there were, how could it get inside the crankcase? If you have an Autozone or OReilly's near you, borrow a leak detector, put the dye in the radiator and spin the water pump with a drill to circulate the dye (remove T-stat if needed). Wait awhile, then do the procedure. If it's a head gasket, may take a few days.