IH W-9 gear timing.

Jeff B in KS · Feb 11, 2017

I am working on a IH W-9 tractor that had been left out in the rain and am now overhauling the engine.I can't figure how the timing gears line up. The single dot crank gear lines up with single dot on idler gear. The double dots on idler gear and camshaft gear seem to be a half a tooth off. The camshaft gear seems to line up with the mark for the magneto. I can't seem to figure what I am doing wrong. Thankyou in advance Jeff.

rustred · Feb 11, 2017

if you have the crank and idler gear marks lined up then just position the camshaft gear so it lines up with the idler mark. might have to turn crank a hair slightly so the cam mark lines up. has to work as marks are there, and should have checked it also before disasembly.

Steve@Advance · Feb 11, 2017

If there is any doubt, put it together as you think it should go, then do some checking before going any further.

First you need to find TDC (top dead center). If there is a mark on the flywheel or the front pulley, you can use that. Or bolt a stop across the #1 cylinder, bring the piston to the stop, mark the crank position, turn the crank the other way to the stop, mark that location, remove the stop, bring the crank to half way between the stop marks, and you will have TDC.

Now hold the lifters on #4 cylinder against the cam with your fingers. Rock the crank back and forth across the TDC mark. You should feel the lifters as they cross overlap on the cam, one is going down just as the other is coming up. If the cam timing is correct, this will happen at TDC.

Then look at the magneto drive. Mock up the magneto, cap, and wires. If the rotor is pointing at #1 position on the cap, the gear is timed correctly.

Bob · Feb 11, 2017

A photo would be GREAT!

Do you have even an I&T service manual? (If not I can look at one tomorrow and post back.)

I'm NOT familiar with that engine, but is it possible a single dot and a double dot need to be aligned, like this example of a TOTALLY DIFFERENT engine...

<img src = "http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/07/7d/f1/medium/0900c15280077df1.gif">

One thing, though, there's over a 99% chance there's a correct way to do it, for the marks that are there, and it shouldn't be necessary to guess/estimate by lifter position.

Jeff B in KS · Feb 13, 2017

Thankyou for responding. I have a I&T and reprint of original manual.

IH W-9 gear timing.

Jeff B in KS

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rustred

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Steve@Advance

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Bob

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Jeff B in KS

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