Broken Rocker Arm bolts - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 06-24-2009, 03:49 PM Thread Starter
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Broken Rocker Arm bolts

Took my engine out because of oil leak and really ruff running. Took the valve covers off and the intake rocker arm bolts for the 7 and 8 cylinders were both broken on the the #7 and #8 had one backed out and the other broke. I put new injectors in, different intake and took turbo out. I'm ashamed to say that there was a socket below one off the rocker arms but not on the other. Any ideas on what could have caused this?

96 Ford F-350 200 cc's, Electric fuel system, TS chip, 17 oil pump, Banks intercooler, 3" intake manifolds, SNOW Water-Meth system, South Bend DxD 3600, Banks brake, 4" stacks. Tuff country ladder bars.
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post #2 of 14 (permalink) Old 06-24-2009, 04:03 PM
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Re: Broken Rocker Arm bolts

Did you remove all the rockers to replace the injectors?

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post #3 of 14 (permalink) Old 06-24-2009, 04:19 PM
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Re: Broken Rocker Arm bolts

If you did.. you probably did install them correctly. You probably have a few bent push rods now as well...


Pull all the glow plugs and rocker arms/push rods.
Grab a coat hanger and pick a cylinder.
Insert the coat hanger wire into the glow plug hole.
Turn engine over by hand until you reach TDC.
Install push rods/rocker arms on that cylinder.
Torque rocker bolts to 20ft lbs.

Move to the next cylinder.

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post #4 of 14 (permalink) Old 06-25-2009, 12:39 AM
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Re: Broken Rocker Arm bolts

Quote:
Originally Posted by Dirk View Post
If you did.. you probably did install them correctly. You probably have a few bent push rods now as well...


Pull all the glow plugs and rocker arms/push rods.
Grab a coat hanger and pick a cylinder.
Insert the coat hanger wire into the glow plug hole.
Turn engine over by hand until you reach TDC.
Install push rods/rocker arms on that cylinder.
Torque rocker bolts to 20ft lbs.

Move to the next cylinder.
Dirk, why is it necessary to install the rockers when you are at TDC. Shouldnt the bolts push the valve spring down? Or is this just a "better habbit"

-Matt

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post #5 of 14 (permalink) Old 06-25-2009, 12:50 AM
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Re: Broken Rocker Arm bolts

It's possible they weren't torqued correctly if you took them off recently.

If you've never had them off then I would say one bolt backed out breaking the other. I've seen that before on a truck with ~160k miles and the covers had never been off, though it was only one rocker.

When I put mine back on I put a small dab of blue loctite on each of the bolts and then torqued them down.

Dave

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post #6 of 14 (permalink) Old 06-25-2009, 01:33 AM
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Re: Broken Rocker Arm bolts

Quote:
Originally Posted by AlaskaRedneK View Post
Dirk, why is it necessary to install the rockers when you are at TDC. Shouldnt the bolts push the valve spring down? Or is this just a "better habbit"

-Matt

If you are at TDC, minimal pressure is on the rockers of that cylinder.

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post #7 of 14 (permalink) Old 06-25-2009, 01:53 AM Thread Starter
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Re: Broken Rocker Arm bolts

I haven't loosened those bolts, sounds like what you said that one may backed out and broke the other. I don't see any bent pushrods but I'll retorque them all and do another compression check.

96 Ford F-350 200 cc's, Electric fuel system, TS chip, 17 oil pump, Banks intercooler, 3" intake manifolds, SNOW Water-Meth system, South Bend DxD 3600, Banks brake, 4" stacks. Tuff country ladder bars.
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post #8 of 14 (permalink) Old 06-25-2009, 05:45 AM
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Re: Broken Rocker Arm bolts

Quote:
Originally Posted by Dirk View Post
If you are at TDC, minimal pressure is on the rockers of that cylinder.
Well, TDC on the compression stroke.

If you made sure both rockers were "loose" would probably the most ideal time to do it but I dont think that it is necessary, especially if you do like dave suggested and added some loctite.

-Matt

'97 F-350 CC/LB 7.3L PSD 4x4 4.10's, Fresh Engine, Stacks, 7 Gauges, AFE, e-fan, BIG Kustom fuel system, 250cc
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post #9 of 14 (permalink) Old 06-25-2009, 05:53 AM
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Re: Broken Rocker Arm bolts

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Originally Posted by AlaskaRedneK View Post
Well, TDC on the compression stroke.

If you made sure both rockers were "loose" would probably the most ideal time to do it but I dont think that it is necessary, especially if you do like dave suggested and added some loctite.

-Matt
Weather the piston is at TDC or BDC, it doesn't make THAT big of difference on a stock valve train.

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post #10 of 14 (permalink) Old 06-25-2009, 05:54 AM
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Re: Broken Rocker Arm bolts

And I wouldn't use loctite, but I guess you could if you wanted.

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