1976 mercrusier 250 cid 165 oil leak at throttle

[baldeagel]

i have a 1976 MFG trihull 25 ft CC with 1 1976 mercuiser 165 hp inline6 at throttle i have a serious oil leak , while running it blows all the oil out where from not sure bilge always filled , wondering if any one has any suggestions on where and what to b looking for
i mean in 200 yards the oil pan is empty just started , all i done is replace the pvc valve and tighten the bolts up , help confused and lost

 

[ziggy]

Re: 1976 mercrusier 250 cid 165 oil leak at throttle

all i done is replace the pvc valve

don't know if this is the problem. but your engine don't use a pvc valve, it's just crankcase ventilation. just like a pvc valve but w/o the check ball in it. it's always open.

other than that. oil always runs downhill. so keep looking above where you see oil at.

fwiw. i had an elusive oil leak on mine. turned out to be a rusted through oil pan. my leak was slow though. yours sounds pretty severe.

tighten the bolts up

oh, and imho, over tight bolts can lead to a leak too. specially on oil pans and valve covers. tighten them to spec., which isn't very tight..

maybe check the oil filter for two gaskets?

edit. if yer loosing that much oil that fast. have ya looked at it while your running it that 200 yds. surely it must be forcibly leaking and be very visible as to where it's coming from..

 

[oldsub86]

Re: 1976 mercrusier 250 cid 165 oil leak at throttle

Check to see if you have the correct oil filter. If the rubber seal is in the wrong place, it will leak bad and quick.
I had that happen on a 6 cylinder Chevy in a 67 pickup.
Got a filter from the parts counter and did not check to see if it was the same as the one on the truck.
Changed the oil and fired it up. Oil pressure light went out and then came back on. Shut it down and checked the engine. Oil all gone.
Filter was supposed to have the rubber seal around the outer edge.The one they gave me had it in closer to the middle. No seal at all.

Randy