Just had a machine shop do a valve job and replace the guides on my 292.

Put it back together, adjusted the valves and started it right up.



I had it idling for about five minutes while I fine tuned things ( timing and the idle )

Got it running really good then gave it a quick rev and then it started knocking.



Pulled the valve covers and one of the intake valves was stuck and the push rod was clanging around...



After just having the guides replaced why would this happen?





Thanks

Corona, Ca.

The most likely culprits are guides fitted too tight or a bent valve stem.  I suggest taking the head(s) back to the machine shop.  If that intake stuck open it is quite likely the piston hit and bent it.

John - "The Hoosier Hurricane"

Yep guides too tight...



Obviously I don't want to use that machine shop again...



Should I call him and tell him they were too tight?

Corona, Ca.

I would call the machine shop and explain what happed.

I would allow him to take a look see at the problems that his work caused BUT I also would explain to him in NO uncertain terms that you will be taking this repair to another machine shop and he will be footing the bill.

He has already had his shot at the repairs.Get it in writing as to his responsability for the necessary repair fees.

Oldmics

I seem to remember Ted talking about the listed clearances being too tight so the shop may have been following bad information. I know there was a conversation about them. Maybe he'll chime in with the answer. I would take them back to the guy and give him an honest shot at fixing his mistake. What he does now will be the true measure of his professionalism. Chuck

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire

I agree with Chuck. I would also get him to pay for all the gaskets, oil, and anything else that needs to be redone because of HIS mistake. You can be gentle but firm. JMHO

If you don't like the way I drive, stay off the sidewalk

I’m assuming the fuel does smell okay and hasn’t gone ‘sour’?  This is a problem that usually shows up with the intake valves after an engine is warmed up, killed, and then restarted after being initially run with bad fuel.  While you mentioned that your problem arose during the initial startup period, that absolves the fuel to some degree but it’s still something worth checking.  The fuel can turn bad in as little as ninety days so that’s always a consideration.

 

Also if your guides are bronze, those do require additional clearance beyond what’s required for the standard iron guides so that’s something the machine shop may have overlooked.  The lack of lube on new guides is also a problem which goes back to the machine shop assembling the heads.  How many years experience does the head guy have is another consideration.  The learning curve is pretty steep for the head building guys if they don’t have an experienced old timer showing them the ropes.

Lorena, Texas (South of Waco)

Ditto on what Ted said.  I would also say to you guys that are so quick to say take it somewhere else, why not at least give the guy a chance.  If it was bad fuel it's not the shops fault, if it is too tight of a guide let the guy make it right. We all make mistakes, I just recently had a valve stick on an ISM Cummins "pump motor" it was running in the field for 24 hrs then quit.  Broken valve rattling around did a lot of damage. After checking the head everything else seemed fine, why did it stick?  We paid for everything!  Customer is still coming back, he's been with us for years.  "Let he without sin cast the first stone".

   God Bless.   Tim                           http://yblockguy.com/

350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor

tim@yblockguy.com  Visalia, California    Just west of the Sequoias

Tim has a good point, production shops have trouble with worn reamers and tooling, and employees not keeping a watchfull eye. Give him a shot at making it good.

Gary Ryan San Antonio.TX.

Exactly, it's a lot easier to criticize than do the actual work!

Frank/Rebop

Bristol, In ( by Elkhart)