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11-27-2012, 11:09 AM | #1 |
Junior Member
Join Date: Nov 2012
Posts: 2
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Model A Engine Noise and worn timing gear
Hello
I am a new Model A owner having bought a 29 Tudor at the Hershey RM Auction. This engine has a knocking noise. We pulled the oil pan to discover that all rod bearings appear tight but the timing gear is missing many teeth. The engine ran fine, starts fine, seems to have enough power. The knock comes and go's at different rpm. Would the timing gear cause this noise? would a bad main bearing cause the timing gear to chip and be causing the noise? Thanks for any help. John |
11-27-2012, 11:18 AM | #2 |
Senior Member
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Re: Model A Engine Noise and worn timing gear
Hello and welcome to the Barn. In answer to the cam, yes it can make the knocking noise you have . Check the spring in front of the timing gear it can let the cam walk forward and backward causing a knock.....Dave
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11-27-2012, 11:23 AM | #3 |
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Join Date: Nov 2010
Location: Anchorage, Alaska
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Re: Model A Engine Noise and worn timing gear
If the timing gear is missing teeth, it's gotta go! Otherwise it will leave you stranded somewhere really inconvenient.
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11-27-2012, 11:30 AM | #4 |
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Join Date: Nov 2012
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Re: Model A Engine Noise and worn timing gear
Thanks for the response. Will do. Does the engine have to be removed to replace the timing gear?
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11-27-2012, 11:52 AM | #5 |
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Join Date: Jun 2010
Location: Temecula, CA
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Re: Model A Engine Noise and worn timing gear
It is common for the A's timing gears to go bad. You won't know about the bearings until you get it running with a new gear. I recommend an aluminum gear, they don't break. It is a good sign that the rod bearings are in good shape, they usually go before the mains ... but not always. The gear can be replaced without pulling the engine, many have been replaced along side of the road. Have fun!
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11-27-2012, 12:04 PM | #6 |
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Location: oroville calif.
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Re: Model A Engine Noise and worn timing gear
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11-27-2012, 07:33 PM | #7 |
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Join Date: May 2010
Location: Northeast Penna
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Re: Model A Engine Noise and worn timing gear
Sounds like the cam thrust plunger is either stuck in its bore in the timing cover, and/ or the spring behind it is broken.
Replace Cam gear, Thrust plunger, and spring. Bet your "bearing knock" goes away. Went through this on my '28 Coupe last summer. Replaced the ancient & failed Fibre gear with an aluminum cam gear, plunger, and spring from Bratton's. No more "bearing knock". Also no excessive noise from metal cam gear. |
11-27-2012, 09:45 PM | #8 |
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Join Date: May 2010
Location: Gardiner Me.
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Re: Model A Engine Noise and worn timing gear
Eye ball the crank gear when you get the cam gear off, I've seen alot of worn out crank gears and they will tear up a new cam in no time. Walt
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11-28-2012, 02:07 AM | #9 |
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Join Date: Nov 2010
Location: Anchorage, Alaska
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Re: Model A Engine Noise and worn timing gear
When I replaced my timing gear (with a bronze one) I was advised to replace the crank gear at the same time and to make sure they came from the same place.
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11-28-2012, 09:45 AM | #10 |
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Join Date: Jun 2010
Location: Southern Pines, N.Carolina
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Re: Model A Engine Noise and worn timing gear
Also when you get the cam gear, get the socket that fits the cam gear nut so you can tighten it properly, instead of the hammer and chisel method that was probably used to install the one you are taking off. You will need to grind off the burs so the socket will fit properly. Iceman
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11-28-2012, 04:14 PM | #11 |
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Join Date: May 2010
Location: Northeast Penna
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Re: Model A Engine Noise and worn timing gear
Replacing the crank-gear at the same time as the cam gear is recommended, and the ideal way to do the job; in my case, I was pushed for time to get my car back in service, and I was only looking to extend the working life of an already-tired 87,000 mile engine...
Mine has racked-up another 1500 miles with the new aluminum gear against the factory steel gear, with no seeming adverse effect. SC Frank |
12-15-2022, 04:34 PM | #12 | |
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Join Date: Jun 2022
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Re: Model A Engine Noise and worn timing gear
Quote:
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12-15-2022, 07:39 PM | #13 |
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Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,496
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Re: Model A Engine Noise and worn timing gear
In a word, no. Some even do it and leave the radiator in place but its easier with that off.
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12-15-2022, 08:28 PM | #14 |
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Join Date: Jan 2020
Location: SF Bay Area
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Re: Model A Engine Noise and worn timing gear
I doubt that Frank is seeing this reply as his post is ten years old...
JayJay
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12-15-2022, 08:50 PM | #15 |
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Join Date: May 2010
Location: Jamestown, ND
Posts: 657
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Re: Model A Engine Noise and worn timing gear
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12-15-2022, 11:54 PM | #16 |
Senior Member
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Re: Model A Engine Noise and worn timing gear
If you don't have Les Andrew's Red Book', I would recommend getting it. You will need a special tool to remove the nut on the timing gear. Andrew's book gives step by step instructions. Bert's part # camshaft wrench A-6260-T
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12-16-2022, 02:46 AM | #17 |
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Join Date: May 2010
Posts: 1,304
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Re: Model A Engine Noise and worn timing gear
You have to jack the front of the engine up to get good access . When you do this remove a bolt each side from the rear engine mount so the engine can pivot as you lift the front . If you dont do this you can crack the flywheel housing .
John in very freezing Suffolk County England . |
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