Oil blowback
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Senior User
Joined: Dec 2010
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From: Shafer, MN
Oil blowback
Getting oil coming back through the breather tube. lots of it. Just replaced the PCV valve, oil pressure and temperature are fine.
Reading my Chiltons manual it says I should use 10w30 oil not the 5w30 im using..
Anyone got any ideas or tips for me here? Im really worried ill have to rebuild the engine here... and I really don't want to have to do that.
Reading my Chiltons manual it says I should use 10w30 oil not the 5w30 im using..
Anyone got any ideas or tips for me here? Im really worried ill have to rebuild the engine here... and I really don't want to have to do that.
Senior User
Joined: Aug 2006
Posts: 377
Likes: 6
Do a compression and/or leakdown test. Chances are the engine is just plain worn out and needs to be rebuilt though. Changing from a 5w30 to a 10w30 isn't going to change anything once it's up to temp, they're both 30 weight at operating temp.
You could try 5w50, or 20w50 if it's not too cold in your neck of the woods, but it'd just be a bandaid if it helps. (edit, I see you're either in WI or MN.. I wouldn't try 20w50 in the winter there )
You could try 5w50, or 20w50 if it's not too cold in your neck of the woods, but it'd just be a bandaid if it helps. (edit, I see you're either in WI or MN.. I wouldn't try 20w50 in the winter there )
Lead Driver
Joined: May 2011
Posts: 5,775
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Cheapest is to rebuild reusing crank and rods, but stroker kits are affordable.
Cam and junkyard gt40s are best bang for the buck for "misewells" while you're in there.
Another option is to source a good running 5.8 and start from there.
Cam and junkyard gt40s are best bang for the buck for "misewells" while you're in there.
Another option is to source a good running 5.8 and start from there.
Lead Driver
Joined: May 2011
Posts: 5,775
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Full cast rotating assemblies are around 1k. Some can be found for less, some more.
The cost of machining can negate much of the savings of reusing parts....so be careful, you might wind up with a 302 when you could have had a 347 for a couple hundred more.
The cost of machining can negate much of the savings of reusing parts....so be careful, you might wind up with a 302 when you could have had a 347 for a couple hundred more.
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Post Fiend
Joined: Nov 2005
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From: Charles Town, W bygod Va
Do you have plenty of airflow to the new PVC valve? If you unhook the vacuum line to it you should have a huge vacuum leak. Sometimes the passages get clogged up.
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Senior User
Joined: Dec 2010
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From: Shafer, MN
I want to keep this cheap if I can, no major mods, with finding out I have a baby on the way I must do this cheap. Bashby I didnt know this until recently since the truck is at my parents I will have to try that this weekend.
Lead Driver
Joined: Jul 2007
Posts: 7,868
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From: Rhode Island
Start doing tests before you plan a rebuild. Change the oil to 10w30, do a compression test and/or a leak down test on the cylinders.
If the engine is worn, and the crank and rod bearing surfaces check out okay, you can get a basic rebuild kit that comes with every gasket you need, 8 new .030" over pistons, new bearings, new oil pump, etc..for $350. Figure in 200-300 bucks to have the block bored over and the pistons pressed onto the rods.
If you wanna get really budget, you can get a set of 0.030" over cast pistons with rings for like $120, and a headgasket set for around $50.
If the engine is worn, and the crank and rod bearing surfaces check out okay, you can get a basic rebuild kit that comes with every gasket you need, 8 new .030" over pistons, new bearings, new oil pump, etc..for $350. Figure in 200-300 bucks to have the block bored over and the pistons pressed onto the rods.
If you wanna get really budget, you can get a set of 0.030" over cast pistons with rings for like $120, and a headgasket set for around $50.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
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From: Mexico, Missouri
Verify that you have good vacuum to the PCV valve and the line is clear from obstruction. Just went through the same problem. P.O. had a cheap PCV valve, not Motorcraft brand, in place, and the rear main leaked liked crazy. Fixed the hose as it had a crack and new Motorcraft PCV valve and I get maybe a drip or 2 a day now.
Edit: I had Rear Main seal on the brain. But.. If the PCV valve is obstructed, you will get a lot of blowback into the air breather.
Edit: I had Rear Main seal on the brain. But.. If the PCV valve is obstructed, you will get a lot of blowback into the air breather.
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