No oil to valvetrain
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Teching In
Joined: Aug 2024
Posts: 19
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From: NY
No oil to valvetrain Hey everyone got a 5.3 new cam new ls7 lifters new pushrods. I've got 50lbs pressure at idle on mechanical gauge.lifters are pumped up if I pull pushrod oil cones out of bottom but I'm getting no oil to both sides of valvetrain. Help plx
Last edited by Matt1271; Aug 9, 2024 at 09:18 PM.
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Oil is comng out of the bottom of the pushrods but not reaching the top with 50 psi of oil pressure makes no sense at all..Pull the valve covers and start the engine and see if the oil is coming up to the rocker arms. Cam and lifters get it first on the LS and I'm a betting man that the oil is getting up there.
Thread Starter
Teching In
Joined: Aug 2024
Posts: 19
Likes: 0
From: NY
It's not I pulled covers . Tried to post video wont let me. There was like just a tiny bit but with covers off nothing at idle. I'm gona change oil with something heavier see if that helps. Would pinched pickup o ring cause that?
Thicker oil won't travel as far as thinner oil and is harder to pump, so trying to figure out the logic behind that.
That is not how you check the preload in an LS Engine. You want .080" preload on the Lifters with the Rocker Tip in the middle on the Valve Stem.
As mentioned the Cam and Lifters get oil first. When pulling the Valve Covers are they covered in oil on the underside or are they dry?
As mentioned the Cam and Lifters get oil first. When pulling the Valve Covers are they covered in oil on the underside or are they dry?
That is NOT it, that's just the fastener torque.
You measure with a Pushrod Length tool with the Rocker tightened at 22ft-lbs and add .080" to that length. Then find what Pushrod out there is close to that number.
This isn't a SBC.
Sounds like this is your first LS Engine and there's something not right with the Cam install. Possibly the front Cam Plate isn't sealing correctly.
You measure with a Pushrod Length tool with the Rocker tightened at 22ft-lbs and add .080" to that length. Then find what Pushrod out there is close to that number.
This isn't a SBC.
Sounds like this is your first LS Engine and there's something not right with the Cam install. Possibly the front Cam Plate isn't sealing correctly.