172 timing gears

Jim TN

Member
Did Ford ever use teflon coated timing gears on the 172 800/4000 engine in the 60's. I have one that sure seems like its jumped time after many hrs of running great.
 
I'm sure you're joking about teflon or jumping a tooth as this would be dang serious. Look for the loose distributor hold down bolt first.
 
v8's had those sorry gears during the 60's. My dist is tight. Have not checked timing yet but have a problem that is baffling. Will post more.
 
Its possible, but if that were the case, it would sound like it had no compression when you hit the starter switch. If this is the case the gears are wasted from something bouncing around in there knocking off the teeth. If its a diesel, youll need a few push rods also. As Tom says , check the easy stuff first.
 
I blew a timing gear on the camshaft once due to a hydraulic pump that seized up. Blew that drive gear on the pump too. Easy to find and not too expensive. This was on a 961 gas.
 
(quoted from post at 14:46:04 09/10/21) I blew a timing gear on the camshaft once due to a hydraulic pump that seized up. Blew that drive gear on the pump too. Easy to find and not too expensive. This was on a 961 gas.
idn't just "jump a tooth" and keep running though, did it?
 
The V8 engines using that that cam gear used a chain to connect the crank and cam. The gears mesh together on the tractor engine. In 45+ years of pulling wrenches on tractors i have never seen one jump time due to to gears under the front cover. I have seen distributor gears break or shear pins but never anything with timing gears.
 
(quoted from post at 22:13:50 09/10/21) The V8 engines using that that cam gear used a chain to connect the crank and cam. The gears mesh together on the tractor engine. In 45+ years of pulling wrenches on tractors i have never seen one jump time due to to gears under the front cover. I have seen distributor gears break or shear pins but never anything with timing gears.
0-4
 
JMOR: It did not jump a tooth. Catastrophic failure as it was running under load at the time. It seems to me since they are gear to gear contact that jumping a tooth would mean a serious problem with the camshaft or camshaft bearing or seriously worn gear.
Jim TN: You haven't told us what it's doing that makes you think it changed timing. If it lost power it could be other issues. More info would be helpful for others to learn from it. Thanks.
 
Mine was also a blown up gear set. I always believed that the Hydraulic pump locked up and the cam stopped then the gears blew up in the front.
I was not running it at the time. Heavy PTO load by way of a 3 PH brush hog.

Just pull the distributor cap off. The rotor isn't turning anymore.
 

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