Re: [ihc] "stuck valves"

[Tom Mandera <tsm1@xxxxxxxxx>]

Is it 10 minutes of idling, or 10 minutes on the highway?

My bet is it's none of the problems he thinks it is.. it's probably shot 
cam bearings and/or plugged oil returns.. when cold, there's oil in the 
pan and enough oil to pump up the lifters.. after a few minutes of 
flogging, the oil is either all in the heads, or it's thinned enough 
that there's not enough pressure (thanks to the poor tolerances on the 
cam bearings) to pump up the lifters.

This results in the valves not opening like they should, which makes a 
miss, and which "self governs" the engine.

I have a 304 and a 345 that are both like this.  I pulled 14,000lbs with 
the 345 all the way to Colorado and back with no problems.  The 304 took 
me to work today.

With the gearing on these rigs, the 345 T'ette wouldn't do more than 
~65mph, and the Scout is stuck around 55mph from the poor top end oiling.

Ryan Moore wrote:

> Figure you guys might know what this is.... have an opinion formed already,
> but figure you guys might know these symptoms better than me.  He's about to
> buy an adapter kit to put a 402 BB chevy into the scout because the 402 is
> rebuilt already and he doesn't want to rebuild the 345 if that's what it's
> going to take to fix it...
>
> opinions?  reccomendations?
>
> Thanks,
> Ryan
>
> ----- Original Message -----
> From: Tim Eastman
> To: Ryan Moore
> <snip>
>
> The 345 runs fine while the engine is still cool.  After about 30 minutes of
> run time, either valves or lifters on the left side of the engine stick, and
> the engine misses.  You can definitly feel a difference in exhaust pressure
> between the duals.  I havent done a compression test yet, with all the smog
> junk around the ex manifold, I'm sure to burn the crap out of my hands.  I
> have tried tranny fliud in the oil, and have used oil detergent, and the only
> difference seems to be that the valves get sticky after ten  minutes of run
> time.
>
>
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