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Old 06-14-2010, 07:08 AM   #1
F1 Flathead
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Default Valve springs/specifications for a 40 Merc

As mentioned in another thread, I have my 40 Merc motor down for a valve job since it appears I have some valves hanging up. I'd like to check the valve springs for proper load. Does anyone have the spec? Also can I get a recommendation for buying replacements if needed? The previous owner said that he installed a "3/4 race" cam so it may not be stock. I plan to check the lift to confirm. I see that it already has adjustable lifters. Should I buy some higher load springs if the cam is, in fact, a performance version?
Thanks,
Dan
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Old 06-14-2010, 11:33 AM   #2
Vergil
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Default Re: Valve springs/specifications for a 40 Merc

My Motors Auto RepairManual calls for ("minimum valve spring pressure, pounds @ inches, length new --- 37 @ 2 1/8")

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Old 06-14-2010, 11:40 AM   #3
Bruce Lancaster
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Default Re: Valve springs/specifications for a 40 Merc

Ford book says "36-40@ 2.125", discard limit is 30.
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Old 06-14-2010, 05:34 PM   #4
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Default Re: Valve springs/specifications for a 40 Merc

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Originally Posted by F1 Flathead View Post
As mentioned in another thread, I have my 40 Merc motor down for a valve job since it appears I have some valves hanging up. I'd like to check the valve springs for proper load. Does anyone have the spec? Also can I get a recommendation for buying replacements if needed? The previous owner said that he installed a "3/4 race" cam so it may not be stock. I plan to check the lift to confirm. I see that it already has adjustable lifters. Should I buy some higher load springs if the cam is, in fact, a performance version?
Thanks,
Dan
If you do in fact have a "3/4" cam it might be cheap insurance to put a set of Zephyr springs in.
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Old 06-15-2010, 05:26 AM   #5
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Default Re: Valve springs/specifications for a 40 Merc

Thanks guys. It took me forever to get the LH head off last night. I hammered, Kroiled, made up some pullers that fasten into hollowed out spark plugs, even tried the old "rope trick". Finally got it off after about 3 hours. I will get the valves and spings off this week and give everything a good going over.
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Old 06-15-2010, 09:58 AM   #6
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Thumbs up Re: Valve springs/specifications for a 40 Merc

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Originally Posted by Pete View Post
If you do in fact have a "3/4" cam it might be cheap insurance to put a set of Zephyr springs in.
I agree, Valve springs are cheap so install some new ones.

I use Zepher Springs in all my engines with a after market cams. They work very well unless you are running a full competation cam, which would be too wild for the street.

If your engine in fact does have an aftermarket cam, stock springs may not be enough.

Chris
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Old 06-15-2010, 10:19 AM   #7
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Default Re: Valve springs/specifications for a 40 Merc

Quote:
Originally Posted by CWPASADENA View Post
I agree, Valve springs are cheap so install some new ones.

I use Zepher Springs in all my engines with a after market cams. They work very well unless you are running a full competation cam, which would be too wild for the street.

If your engine in fact does have an aftermarket cam, stock springs may not be enough.

Chris
Chris,
Thanks for the feedback. Where's the best place to get a set of Zepher springs?
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Old 06-15-2010, 10:55 AM   #8
Karl Wolf
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Default Re: Valve springs/specifications for a 40 Merc

Reds Headers has a repro Zepher spring, they are running fine in my 59ab... Karl
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Old 06-21-2010, 09:34 AM   #9
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Default Re: Valve springs/specifications for a 40 Merc

I checked the lift on my cam and it is nearly stock lift. I can't check duration but my guess is that it is an Isky 77 or 88, not a Max 1 or 400 Jr which both have much higher lift. I checked the valve springs and they all measure over 40 lbs at 2 1/8 inches so I think I will try and use them. The lifters and guides were all covered with a real sticky substance (old, overheated oil?). I'm thinking that my problem will be fixed when I get it all back together.
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Old 06-21-2010, 08:44 PM   #10
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Default Re: Valve springs/specifications for a 40 Merc

Thanks for the update Flathead.

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