Roller Rocker Question?

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rick@canoeoutriggers.com - 02 Apr 2006 00:34 GMT

My 70 mustang 351W motor has roller rockers...I get a little valve
clatter for about 2 minutes when cold....then it goes away. The motor
runs strong...It has hydraulic lifters...Is this a lifter problem or a
roller rocker needing a slight adjustment? Is there a way to tell the
differents?

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Michael Johnson, PE - 02 Apr 2006 04:59 GMT

> My 70 mustang 351W motor has roller rockers...I get a little valve
> clatter for about 2 minutes when cold....then it goes away. The motor
> runs strong...It has hydraulic lifters...Is this a lifter problem or a
> roller rocker needing a slight adjustment? Is there a way to tell the
> differents?

I would start with readjusting the rocker arms. Are you sure it is not
the lifters pumping up?

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.boB - 02 Apr 2006 06:29 GMT

It's from the oil draining out of the lifters and valve train as the engine
sits. It takes a few seconds for the oil to get back up there and quiet things down.
About 10 years ago I had a '69 Mustang 351W that did the same thing. I put in
a can of Slick 50 and it stopped doing that. Start ups were very quiet after that.

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.boB
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Michael Johnson, PE - 02 Apr 2006 17:53 GMT

>> My 70 mustang 351W motor has roller rockers...I get a little valve
>> clatter for about 2 minutes when cold....then it goes away. The motor
[quoted text clipped - 8 lines]
> thing. I put in a can of Slick 50 and it stopped doing that. Start ups
> were very quiet after that.

Careful, or you will awake the oil additive gods of war by extolling a
positive use of Slick 50. ;)

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.boB - 05 Apr 2006 05:42 GMT

>>> My 70 mustang 351W motor has roller rockers...I get a little valve
>>> clatter for about 2 minutes when cold....then it goes away. The motor
[quoted text clipped - 11 lines]
> Careful, or you will awake the oil additive gods of war by extolling a
> positive use of Slick 50. ;)

I hear ya. I'm tapping theses keys very quietly, the lights are off, the shades
are down, the dogs at the kennal, and I'm going to hide in the crawl space for the
next few hours :)

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