Rocker turning sideways

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Rocker turning sideways

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Rocker turning sideways - 7/13/2008 11:04:13 AM

twin300zxturbo

Posts: 3
Joined: 7/13/2008
Status: offline

I have a late 60''s early 70''s chevy 350 in an old 4x4 truck I have. I broke a push rod in half somehow. I replaced the push rod and adjusted the valves as instructed. But now when I try to crank the motor the rocker itself slowly twists sideways and wants to fall off of the valve spring. I assume that is how my first push rod broke. I was told it was the lifter causing the problem so I pulled the intake off and the lifter out but i can see no physical damage to it. Does anyone have any clue what could be causing this?

Post #: 1

RE: Rocker turning sideways - 7/13/2008 2:28:21 PM

1Gary

Posts: 74
Joined: 5/24/2008
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Are you running a aftermarket cam?.Any chance of coil spring bind??.

(in reply to twin300zxturbo)

Post #: 2

RE: Rocker turning sideways - 7/13/2008 3:11:58 PM

twin300zxturbo

Posts: 3
Joined: 7/13/2008
Status: offline

The motor came out of another car so i dont know, but it could have an aftermarket cam. I was also told it might be the lobe on the cam being warped or something but i felt of it with my finger through the lifter hoe and it feels fine.

All this began one day when it slung a belt and ran hot for a few minutes. I noticed and pulled over and replaced the belt and limped it home.

(in reply to twin300zxturbo)

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RE: Rocker turning sideways - 7/13/2008 7:04:39 PM

old dog

Posts: 240
Joined: 12/25/2007
Status: offline

greeting''s turbo ,check the slot in the cylinder head that the push rod slides through ,and the rocker arm stud ,they get slotted on the older abused motor''s .

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william j allison

(in reply to twin300zxturbo)

Post #: 4

RE: Rocker turning sideways - 7/13/2008 10:01:30 PM

twin300zxturbo

Posts: 3
Joined: 7/13/2008
Status: offline

thanks. yes it seems looser than the others are. so what can be done about that? nothing ? get new heads?

(in reply to old dog)

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RE: Rocker turning sideways - 7/14/2008 5:47:57 AM

old dog

Posts: 240
Joined: 12/25/2007
Status: offline

it may be easier to get new head''s ,but you can replace the stud if it is slotted ,if the guide slot is worn out you could convert them to screw in stud''s with guide plate''s ,but it could be pricey .

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william j allison

(in reply to twin300zxturbo)

Post #: 6