OT Rod noise on a 2 cly Ford

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Model T Ford Forum: Forum 2015: OT Rod noise on a 2 cly Ford
Top of pagePrevious messageNext messageBottom of page Link to this message  By Richard Gould, Folsom, CA on Monday, May 04, 2015 - 06:25 pm:

Working on a 2 cylinder Ford and have a knock that sounds like a loose rod. I took out two shims from the hinged bearing (It had opened up to 7 thou) and was able to lock it up with a strip of newsprint. Still have the knock. I've adjusted the mains, inspected timing gears etc. Have good even compression, good spark to each cylinder, valve timing is on the money, carburetion is good. Nothing is hitting inside the engine compartment so I think somehow its still that darn rod. I see there very little side to side clearance on the rod bearing and wonder if somehow the rod may be bottoming out on the radii. Anyone have any thoughts?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Redelman on Monday, May 04, 2015 - 06:35 pm:

Check for excessive wrist pin clearance in the pistons.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Erik Barrett in Auburn Ca. on Monday, May 04, 2015 - 06:51 pm:

Short each of the spark plugs to disable that cylinder. A major change in the knock will indicate the problem is in that cylinder. You may have to wind it up a bit before dropping half your cylinders.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Kohnke Rebabbitting on Monday, May 04, 2015 - 07:50 pm:

Check the rod alignment for Twist, Bend, and off set.

Herm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Evan in Paso Robles on Monday, May 04, 2015 - 08:54 pm:

Hi Richard,

Were you able to check the hinge pin in the rods for loose fit? The pin will wear and the holes in the rod and rod cap will wear causing excess clearance in the bearing. There are several ways to correct this issue. You might want to call Jeff Beaumont for further ideas.

Evan in Paso Robles

P.S. is this in the Model F? That is a very sweet ride!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Rob Heyen - Eastern Nebraska on Tuesday, May 05, 2015 - 10:19 am:

Evan,
We are in the process (well, Dean Yoder is) of putting in oversize pins in our Model K rods for this same reason. With a hinged bearing, the pin wear and then there will be "slap" or slop.
You can see part of the hinge on the back side of this pic of one of the rods, along with the oil hole on the hinge bolt side:


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