1981 f 150 6 cyl 4 speed

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Jul 17, 2004 | 07:53 PM

hster

Thread Starter

Freshman User

Joined: Jul 2004

Posts: 45

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1981 f 150 6 cyl 4 speed

I assume this must be a 6 cyl flat heat - 6 plugs on 0ne-side. I am having a serious blowby problem. PCv leaking oil down the side of engine.Should I try & clean pcv valve & add some engine restorer ( additive) , or what do you suggest? Also, I just changed valve cover gasket and oil pan gasket. Stll have oil leaking ( fair amount) at back of oil pan where meets tranny. Must be rear main seal ,right? if so, any ideas how to change it without dropping tranny? I was able to get oil pan gasket with dropping the trans.

Any ideas are greatly appreciated.

Please help no money for a rebuild yet!!

Jul 17, 2004 | 10:08 PM

Kenny

Cargo Master

Joined: Jul 1999

Posts: 2,484

Likes: 7

From: New Egypt, New Jersey

Hi,

Definately not a flathead.

What you have is a 300 Inline six. I'll move this over to the Inline six forum, where they may be able to better help you.

Moved from the Flathead forum.

Jul 17, 2004 | 10:46 PM

bigbrown84truck

Senior User

Joined: May 2004

Posts: 347

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forget cleaning the pcv valve, it's a 5 dollar part, just buy a new one along with all the new lines leaving it, you'll spend about 10 dollars, make sure it has the proper breather oil cap as well, not a screw on job with no breather that napa tries to give as the replacement. also when u get the pcv valve make sure you get the right one, do not use the one in the truck now to go off of, it could be the wrong one, go to wal-mart or a parts store and get one and look it up in the book. you shoulda did this stuff before u replaced your valve cover gasket since having too much pressure can blow the valve cover gasket back out. as far as the oil leak you have now, you have to pull the tranny, it sounds like the rear main seal, i have the same problem. if what i mentioned above does not fix your blow by problem you should know that the motor will run forever with blow by, the 300 is all but unkillable, just gotta make sure to change out that crappy nylon timing gear before it craps out or things could get messy.