inline six head replacement and valve lash
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Joined: May 2011
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inline six head replacement and valve lash
Hi guys my nephew had a rebuilt head put on his 96 150 inline. A friend did it for him. the truck had 269000 miles on it. they used the original rods and the rockers were used from the head that was rebuilt (from the junk yard). To add insult to injury they mixed the rods up. They did not torque the heads down properly. the truck was running fine when he pulled up in my driveway. However the valve train seemed to be making a lot of noise as if everything was loose. so I had him take the intake and vavle cover off and I retorqed the heads using the book. when i got to the vavles (non-adjustable type). I cannot get the lifters to bleed down. I understand that there is tool to aid in this. I want to check the .125 - .175 clearence. it seems that the rods are to long! when i set #1 at tdc the exhaust vavle actually comes off the seat(opens very little) the only way I can know for sure is to make sure the lifters are bleeding down. any suggestions and insights on making a bleed down tool or alternate method to check this.
Postmaster
Joined: Mar 2008
Posts: 2,703
Likes: 7
From: Des Moines, Iowa
I might suggest your rockers are probably shot with 269K on them. Also the rods should be the same length if they used them out of a 4.9L with the same head (same rocker style) as the origional.
Also it sounds as though you might already know this but rockers, rods, and lifters should be used in matched pairs. There are plenty of guys that know way more than me but if I rebuilt a head i would have spent the extra $150-$200 on new lifters, rockers, and rods.
6cylbill will probably be along shortly to add more...
Also it sounds as though you might already know this but rockers, rods, and lifters should be used in matched pairs. There are plenty of guys that know way more than me but if I rebuilt a head i would have spent the extra $150-$200 on new lifters, rockers, and rods.
6cylbill will probably be along shortly to add more...
Postmaster
Joined: Mar 2008
Posts: 2,703
Likes: 7
From: Des Moines, Iowa
Assuming the shop did a good job on the head and assembled the rocker assembly's doesn't tell you they are bad until the head is back on the truck to be checked for clearance/gap after being torqued down. And any good shop I know whould have definatly recommended replacing the lifters and rods so as not to create a weak point with a reconditioned head being put on.
I am assuming you have the lifters out of the truck...???
If you do get a "C-clamp" and cut the pressure plate off the end you'll be able to force the threaded rod down inside the lifter to compress it. make sure to keep the lifters organized once they are out so they get back into the same spot (ie egg carton helps). Also use something soft between the lifter face and the c-clamp to keep from damaging it... you wouldn't want a scared up lifter face coming into contact with your cam.
I am assuming you have the lifters out of the truck...???
If you do get a "C-clamp" and cut the pressure plate off the end you'll be able to force the threaded rod down inside the lifter to compress it. make sure to keep the lifters organized once they are out so they get back into the same spot (ie egg carton helps). Also use something soft between the lifter face and the c-clamp to keep from damaging it... you wouldn't want a scared up lifter face coming into contact with your cam.
