Blowby
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Junior User
Joined: Nov 2012
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Blowby
Hey guys this engine is freshly built with maybe 4000 miles on it had some issues being first time build had a lot of clattering took her to machine shop found out pushrods were 100 thousandths short got it back ran okay but then I noticed it had a lot of blowby idk if it was the shop or what any idea on this rings, head gasket etc... PVC works. If I get on it it will pop my dipstick out and throw oil all over headers and undercarriage quite a bit of oil. It kind of chugges when a loads put to the engine in high gear like goin up hills.Plan on a compression test tomorrow.
94 f150 5.8
Rhs heads
Edelbrock intake
Little bit larger cam
94 f150 5.8
Rhs heads
Edelbrock intake
Little bit larger cam
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Blowing dipstick out means high crankcase psi.
Thoughts are...
Oil level to high
PCV valve hose restricted
Fresh air intake tube restricted
Rings not seated..? Synthetic oil used to early after break in?...
When did the blowby start? Before or after pushrod length was corrected?
Thoughts are...
Oil level to high
PCV valve hose restricted
Fresh air intake tube restricted
Rings not seated..? Synthetic oil used to early after break in?...
When did the blowby start? Before or after pushrod length was corrected?
Cargo Master
Joined: Nov 2013
Posts: 2,168
Likes: 4
From: South Central,MO
That's exactly where I was headed. Something like .010 pistons in .030 holes or ring gaps to big or clocked wrong or who knows what.
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I built the top end bought it as rebuilt short block from Forbes shop ism doin compression check Sunday and I'll get back with y'all it will only push the dipstick out and oil when getting on it as well as the smoke... It's been a dissappointing build
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the leak-down test will give you more leverage with the shop than a compression test. since you did the top end they could well try to point the finger at your work, rather than their own. if a leak-down test shows that leakage is past the rings then they should make it right.
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Head gasket seems probable cause. At this point, I would be inclined to bite the bullet, pull engine.
Reason I say this is because once coolant has been cycled in the crank and internals, it acts like acid on bearings and iron.
A fresh set of bearings on crank and rods would be 1st on my list. Yeah its lengthy now, but it may prove a burden later down the road. Also doing major R&R with it still in truck may seem worthy, but its hard on the back, knees, and neck. On an engine stand proves so much easier and less lip biting if you make a mistake that cost more hours when its still in the truck.
Others may chime in to prove me otherwise.
Reason I say this is because once coolant has been cycled in the crank and internals, it acts like acid on bearings and iron.
A fresh set of bearings on crank and rods would be 1st on my list. Yeah its lengthy now, but it may prove a burden later down the road. Also doing major R&R with it still in truck may seem worthy, but its hard on the back, knees, and neck. On an engine stand proves so much easier and less lip biting if you make a mistake that cost more hours when its still in the truck.
Others may chime in to prove me otherwise.
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Junior User
Joined: Nov 2012
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alright guys sorry for the late reply. i bit the bullet pulled the motor and sent it off the machine shop. results came in yesterday... holes in the pistons... probobly due to detonation. one scored cylinder wall not to bad a hone will fix. so now new pistons, rings, hone, have set up my rhs heads, so basically like getting a long block all for about 800. not to bad. thanks for the responses and the help yall make life a little bit easier.
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