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still leaks after new water pump ,....


chessman21

Well-Known Member
Joined
Jan 7, 2016
Messages
75
Vehicle Year
1969 f-600hd
Transmission
Automatic
new water pump installed, upon test run it appears to be leaking from were timing cover comes in contact with front on engine? Could leak be from the timing cover gasket? Didnt know it came in contact with the coolant.

Or is that part of the head under that? The source of leak is in the area at about 10:00 if timing cover face was a clock..
 
Common leak point on 4.0l OHV(1990-2000) is where the aluminum lower intake contacts the passenger side head at the front.

Coolant flows thru the intake from one head to the other.
Because head is cast iron and intake is aluminum, corrosion can eat away at the gasket and aluminum at that point.
Give that a close look, it would leak down to where you describe the coolant showing up.

No, as you suspect, there is no coolant behind the timing cover on the 4.0l OHV, and if there was it would be in the oil pan now and you would have the "milkshake" colored oil, which you don't mention.

You can rent a cooling system pressure tester, it is a rad cap fitting with a gauge and hand pump.
That allows you to pump up the COLD cooling system to 20psi and then look for, feel for, leaks.

Smaller leaks are often hard to find unless cooling system gets pressurized, which only happens when engine is fully warmed up, and at that time the hot coolant will evaporate fairly fast when it leaks out onto hot engine parts.
Cold pressure test makes leaks much easier to ID
 
Last edited:
Thxs Ron for all your help.. Im gonna try some K&W Block seal and see if thall buy me a few more miles.
 

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