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Valve Spring Woes

WanderingSpleen
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WanderingSpleen Enthusiast

WanderingSpleen

Posted
Posted

Just found a broken exhaust valve spring on hole #4.. happened to see it when I started the third pass torqueing down new head bolts after a dod delete.

I would like to do anything I can to avoid removing the head again.. what would be the second best method to replace this bad boy?

 

 

T4Q6U3C.jpeg

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

A length of cotton rope inserted via the sparkplug hole and the piston run up against it will hold the valve closed. A long stud in the rocker mount and a nut with a fork acting on the retainer will free the keeper. There may be a KD tool already fabricated for that. Or perhaps @newdude will chime in. I'm certain they don't pull heads for a broken spring at the dealer. 

Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted (edited)

Compressed air in cylinder sparkplug hole using air nozzle with rubber tip easy with 2 people 1 person keeps cylinder pressured while other changes spring. Pressure in the cylinder keeps valve up and not dropping. Just make sure both exhaust and intake valves are closed before doing it.

Edited by Silverado4x4
  • Like 1
newdude Senior Enthusiast

newdude

Posted
Posted (edited)
13 hours ago, Grumpy Bear said:

A length of cotton rope inserted via the sparkplug hole and the piston run up against it will hold the valve closed. A long stud in the rocker mount and a nut with a fork acting on the retainer will free the keeper. There may be a KD tool already fabricated for that. Or perhaps @newdude will chime in. I'm certain they don't pull heads for a broken spring at the dealer. 

 

 

Compressed air through the spark plug hole.  GM has a special tool valve spring compressor for gen 5 heads for replacing valve springs on car, but the aftermarket makes one as well.

 

Amazon.com: Michigan Motorsports Valve Spring Compressor Tool for L83 L86 LT4 Gen V Gen 5 Chevy LT1 Engine 5.3 6.2 : Automotive 

Edited by newdude
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WanderingSpleen Enthusiast

WanderingSpleen

Posted
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Posted

This is the exact route I decided to take. Cheap spring compressor that will hopefully work twice and a hose from my compression tester that hooks directly to the air compressor. 👌

DK91105 Enthusiast

DK91105

Posted
Posted (edited)

Put the piston at TDC and it won't be able to drop in enough to lose it.   Can I contact you? I've got some questions about my own dfm delete going on.  

Edited by DK91105

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