1974 FJ40 crankcase pressure/oil leaks (1 Viewer)

[Thomas08]

I have a 1974 fj40 with f155 stock motor that has a lot of crankcase pressure and recently had side over, oil pan gasket and valve cover gasket leaks. These leaks have not all occurred at once, but once I fix one issue, drive several miles another ones happens. Is there someone with experience that could help me determine what would cause these issue ? I appreciate any help anyone could give me. Thanks in advance,
Tom

 

[flee]

I just faced this with my '68 F. Two pistons had broken compression rings, even some pieces missing!!
A compression check will reveal much.

 

[ceylonfj40nut]

Is your PCV valve in good working order?

 

[Thomas08]

I just faced this with my '68 F. Two pistons had broken compression rings, even some pieces missing!!
A compression check will reveal much.

Thank you I will check it out.
Tom

 

[Thomas08]

Is your PCV valve in good working order?

I will check to see.
Thanks
Tom

 

[ceylonfj40nut]

Check PCV valve first. Cheaper and easier to do.

 

[SteveH]

Start the engine and remove the oil filler cap. If there is a wind coming out, you have a lot of blowby and internal engine wear. Also check PCV as mentioned.