I posted a few weeks ago on a H engine problem caused by an unknown increase in rpm while idling. I have checked the governor and all is as it should be. I have pulled the valve cover and oil pan. Nothing broken. Closed valves on each cylinder and pressure checked all ok so no valves through pistons. Can I assume I have a spun bearing and any advice on a way forward is appreciated.
- Thread starter Pete_5959
- Start date
LaBoyteaux
Member
I tried to go back to your earlier post to understand the problem.
Have you tried holding the carburator in the idle position and restarting the engine. If engine started racing and governor was OK I'm wondering if there is some problem in the governor-carburator linkage or throttle valve in the carburator. If oil pressure is normal probably no spun bearing.
teddy52food
Well-known Member
A screw came out of the throttle plate & made it idle faster and now the screw is on top of the piston and hitting the head.
Original post: unlaoded my 52 H at a local show today. While it was idling I was stowing away the chains and the engine RPMs raced. I ran and killed the ignition switch. It will start but there is an audible clank!!! Any suggestions on where to start? Thank you.
Rustred...The RPM were higher than 1750. One poster says I should be able to determine by looking. I have the bottom opened up and I see nothing unusual. Mind you I am no master engine mechanic! No filings in pan, no broken pieces, and it all moves as it should. I would like to tackle as much of this as I can but do not want to get in deeper than I should. Thank you.
Pete in NC
Rustred...The RPM were higher than 1750. One poster says I should be able to determine by looking. I have the bottom opened up and I see nothing unusual. Mind you I am no master engine mechanic! No filings in pan, no broken pieces, and it all moves as it should. I would like to tackle as much of this as I can but do not want to get in deeper than I should. Thank you.
Pete in NC
I agree with teddy had the same thing happen to me. Someone replaced the brass screw in the choke and put a steel one in and it broke off and got sucked up on top of a piston and it started hammering. Pulled head and picked out the screw and put head back on with a dimple in the top of the piston.
Bob
Bob
gene bender
Well-known Member
So whats keeping you from pulling each bearing cap one at a time then the mains to know for sure they are all OK. Nlonger than it will take then you will know for sure.
Janicholson
Well-known Member
The choke plat can be seen through the intake from the air cleaner. Use a good light. The throttle plate is also screwed in place. If the throttle plate comes loose, the throttle plate will get crooked and jamb in the bore. This prevents it from closing, and with a little governor action can make it race way up in RPM. My guess is that if you find that to be the case, and you cannot see the screw with a good light in the cylinders (through the plug hole with each piston up at the top) you will be pulling the head to get the screw out. Jim
The exact thing happened to me a long time ago on my dad's H. I took all the spark plugs out and brought the pistons up to TDC one at a time and looked in with a flashlight. I found the screw flattened and slightly imbedded in the piston top of one of the pistons. I used a long thin screwdriver to dislodge it from the piston, put grease on the end of the screwdriver, and lifted the screw out. By the way, this was after dropping the pan to check rod bearings and other things. Roger
Janicholson
Well-known Member
Cut and not yet dry. Jim
Owen Aaland
Well-known Member
Take a # 194 light bulb, straighten the contact leads, and solder a few feet of electrical wire to each one. Add an alligator clip to the other end of each wire. Attach the leads to a 12 volt battery. You will now have a light that will fit through the spark plug holes.
You should be able to see where the screw is imbedded in the piston. You should be able to pop it loose with a long screw driver and pull it out with a small magnet. If the screw is brass, put a dab of grease on the end of the screw driver and use that to get the screw out.
You should be able to see where the screw is imbedded in the piston. You should be able to pop it loose with a long screw driver and pull it out with a small magnet. If the screw is brass, put a dab of grease on the end of the screw driver and use that to get the screw out.
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