The Ford Barn

Randy · 03-30-2012, 03:56 PM

What's the max allowable backlash between the aluminum timing gears on a 59AB before they should be replaced? Thanks!

john mullen · 03-30-2012, 04:34 PM

I dont recall a specific measurment for that. but I would say that anything over .015 would my limit .JMO

ken ct · 03-30-2012, 06:28 PM

OMO but .015 sounds like a lot to me. ?? ken ct.

rotorwrench · 03-30-2012, 06:29 PM

On the later 8BA type engine it is listed as .002" to .003". Oversize gears used to be available if it was too excessive. If a fellow has the mains align bored you have to check & make sure it doesn't have too little a backlash. You might need some worn gears for that situation. I don't know if they made undersize ones or not.

Randy · 03-31-2012, 01:55 PM

Checking with a dial indicator against a tooth on the crank gear, I can rotate the crankshaft back and forth between the cam gear teeth about 0.012", should I replace them?

JWL · 04-01-2012, 04:44 AM

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About .010 is "normal" for new gear sets. I would not worry about a used set at .012. Keep the end play in check and you will never know whether there is .005, .010, or even .020. The gears grow a little when warmed up and the aluminum gears need more clearance than the fibre.

Walt Dupont--Me. · 04-01-2012, 06:48 AM

Quote:

Originally Posted by rotorwrench

On the later 8BA type engine it is listed as .002" to .003". Oversize gears used to be available if it was too excessive. If a fellow has the mains align bored you have to check & make sure it doesn't have too little a backlash. You might need some worn gears for that situation. I don't know if they made undersize ones or not.

I lined bored engines for 28 years, mostly industrail engines, alot of them made undersize gears if they were to tight. Walt

03-30-2012, 03:56 PM	#1
Randy Senior Member Join Date: May 2010 Location: Austin Posts: 696	Timing Gear Backlash on 59AB, what's the max allowable? What's the max allowable backlash between the aluminum timing gears on a 59AB before they should be replaced? Thanks!

03-30-2012, 04:34 PM	#2
john mullen Senior Member Join Date: Jan 2012 Location: Lanexa Va Posts: 254	Re: Timing Gear Backlash on 59AB, what's the max allowable? I dont recall a specific measurment for that. but I would say that anything over .015 would my limit .JMO

03-30-2012, 06:28 PM	#3
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: Timing Gear Backlash on 59AB, what's the max allowable? OMO but .015 sounds like a lot to me. ?? ken ct.

03-30-2012, 06:29 PM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Timing Gear Backlash on 59AB, what's the max allowable? On the later 8BA type engine it is listed as .002" to .003". Oversize gears used to be available if it was too excessive. If a fellow has the mains align bored you have to check & make sure it doesn't have too little a backlash. You might need some worn gears for that situation. I don't know if they made undersize ones or not.

03-31-2012, 01:55 PM	#5
Randy Senior Member Join Date: May 2010 Location: Austin Posts: 696	Re: Timing Gear Backlash on 59AB, what's the max allowable? Checking with a dial indicator against a tooth on the crank gear, I can rotate the crankshaft back and forth between the cam gear teeth about 0.012", should I replace them? Last edited by Randy; 04-01-2012 at 08:29 AM.

04-01-2012, 04:44 AM	#6
JWL Member Emeritus Join Date: May 2010 Location: Fitzgerald, Georgia Posts: 2,204	Re: Timing Gear Backlash on 59AB, what's the max allowable? Sponsored Links (Register now to hide all advertisements) About .010 is "normal" for new gear sets. I would not worry about a used set at .012. Keep the end play in check and you will never know whether there is .005, .010, or even .020. The gears grow a little when warmed up and the aluminum gears need more clearance than the fibre.