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valve timing,

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valve timing, #1 This topic is about my 1969 MG MGC
Russ Coyote Russ E Gainesvill, MO., USA Sign in to contact 1950 MG TD "Andy" 1969 MG MGC "NIGEL" 1982 Chevrolet Corvette "GENERAL" 2006 Harley-Davidson Softail "Big Red"	Topic Creator (OP) Apr 12, 2024 08:14 AM Joined 12 years ago 66 Posts

Hi all, Can you tell if cam timing is right by observing valve operation with valve cover removed?
Thanks greatly,

The repair manual says to position the crank key groove at 12 o'clock and the cam groove at 1 o'clock. Match the gear dimples and install gears. Has anyone used this procedure successfully?
Thanks exceedingly, Coyote

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Re: valve timing, #2
MG four six eight Bill Jacobson WA, USA Sign in to contact	Apr 12, 2024 09:52 AM Top Contributor Joined 16 years ago 542 Posts

Technically it's possible but you would need a degree wheel, dial indicator and of course the exact camshaft specs. Even if you have the cam specs, if there is any wear in the cam lobes it could skew your readings somewhat.

The sure fire way to confirm if the valve timing has jumped is to pull the cover. Then using a straight edge, check to see if the marks on the cam/crank sprockets are pointing at each other and aligned with the center line between the crank and camshaft.

Bill

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Russ Coyote thanked MG four six eight for this post

Re: valve timing, #3
Russ Coyote Russ E Gainesvill, MO., USA Sign in to contact 1950 MG TD "Andy" 1969 MG MGC "NIGEL" 1982 Chevrolet Corvette "GENERAL" 2006 Harley-Davidson Softail "Big Red"	Topic Creator (OP) Apr 12, 2024 11:35 AM Joined 12 years ago 66 Posts

Thanks Bill,
I am installing new gears, I have the old ones removed already.

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Re: valve timing, #4
tdgray Todd Gray Uniontown, OH, USA Sign in to contact 1960 MG MGA "Abigail" 1968 MG MGC GT "Lucy" 1971 BMW 2800CS Coupe 2005 Mercedes-Benz SLK55 AMG	Apr 13, 2024 07:16 AM Top Contributor Joined 12 years ago 956 Posts

Are you just replacing with stock gears?

Stock cam?

If so there is really no reason to reinvent the wheel. There is a procedure for lining up the crank and cam.

Do you have a workshop manual? If not I can take a pic of the relevant section for you.

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Re: valve timing, #5
Russ Coyote Russ E Gainesvill, MO., USA Sign in to contact 1950 MG TD "Andy" 1969 MG MGC "NIGEL" 1982 Chevrolet Corvette "GENERAL" 2006 Harley-Davidson Softail "Big Red"	Topic Creator (OP) Apr 14, 2024 01:28 AM Joined 12 years ago 66 Posts

Thanks Todd, I am replacing the old gears with new stock gears from Moss. Using stock cam.
Could you mail me the diagram and instructions, I greatly appreciate your response,,
ALDLQF

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Re: valve timing, #6
tdgray Todd Gray Uniontown, OH, USA Sign in to contact 1960 MG MGA "Abigail" 1968 MG MGC GT "Lucy" 1971 BMW 2800CS Coupe 2005 Mercedes-Benz SLK55 AMG	Apr 14, 2024 09:11 PM Top Contributor Joined 12 years ago 956 Posts

Hey Russ

Sorry… been away for a couple days. Have a couple of family members in the hospital so doing the run around town between them.

I’ll dig my manual out tomorrow.

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Re: valve timing, #7
B-racer Jeff Schlemmer Shakopee, MN, USA Sign in to contact 1950 Willys Jeep Pickup "Ratrod" 1964 Land Rover Series IIA 1971 MG MGB	Apr 16, 2024 07:31 AM Top Contributor Joined 17 years ago 20,025 Posts

A degree wheel is key. Get one or print one.
Last weekend we were sorting valve timing on a newer Ford motor. It was producing about 90 psi cranking compression. I made a quick guess at optimal intake cam timing and the cranking compression jumped to 275 psi. I think that was the equivalent of 1 tooth at the cam. Its less dramatic with a dual cam, but the point is, use a degree wheel or your guess will only be a bad guess and no one here on the forum can see what you see.

jeff@advanceddistributors.com

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Re: valve timing, #8
Russ Coyote Russ E Gainesvill, MO., USA Sign in to contact 1950 MG TD "Andy" 1969 MG MGC "NIGEL" 1982 Chevrolet Corvette "GENERAL" 2006 Harley-Davidson Softail "Big Red"	Topic Creator (OP) Apr 19, 2024 09:35 PM Joined 12 years ago 66 Posts

Thanks Jeff, I will order one and give it a go, once I learn how to use it.
ALDLQF Russ

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