|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
06-14-2010, 07:08 AM | #1 |
Member
Join Date: May 2010
Location: Brighton Michigan
Posts: 47
|
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 |
06-14-2010, 11:33 AM | #2 |
Senior Member
Join Date: May 2010
Location: Tehachapi, CA
Posts: 361
|
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")
Vergil
__________________
Bigger fonts to aid in reading |
Sponsored Links (Register now to hide all advertisements) |
|
06-14-2010, 11:40 AM | #3 |
Member Emeritus
Join Date: May 2010
Location: Madison, NJ
Posts: 5,230
|
Re: Valve springs/specifications for a 40 Merc
Ford book says "36-40@ 2.125", discard limit is 30.
|
06-14-2010, 05:34 PM | #4 | |
Senior Member
Join Date: May 2010
Location: Wa.
Posts: 5,374
|
Re: Valve springs/specifications for a 40 Merc
Quote:
|
|
06-15-2010, 05:26 AM | #5 |
Member
Join Date: May 2010
Location: Brighton Michigan
Posts: 47
|
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.
Dan |
06-15-2010, 09:58 AM | #6 | |
Senior Member
Join Date: May 2010
Location: PASADENA, CA
Posts: 1,882
|
Re: Valve springs/specifications for a 40 Merc
Sponsored Links (Register now to hide all advertisements)
Quote:
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 |
|
06-15-2010, 10:19 AM | #7 | |
Member
Join Date: May 2010
Location: Brighton Michigan
Posts: 47
|
Re: Valve springs/specifications for a 40 Merc
Quote:
Thanks for the feedback. Where's the best place to get a set of Zepher springs? |
|
06-15-2010, 10:55 AM | #8 |
Senior Member
Join Date: May 2010
Location: Mill Valley,Ca.
Posts: 1,509
|
Re: Valve springs/specifications for a 40 Merc
Reds Headers has a repro Zepher spring, they are running fine in my 59ab... Karl
|
06-21-2010, 09:34 AM | #9 |
Member
Join Date: May 2010
Location: Brighton Michigan
Posts: 47
|
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.
|
06-21-2010, 08:44 PM | #10 |
Senior Member
Join Date: May 2010
Location: Tehachapi, CA
Posts: 361
|
Re: Valve springs/specifications for a 40 Merc
Thanks for the update Flathead.
Vergil
__________________
Bigger fonts to aid in reading |
Thread Tools | |
Display Modes | |
|
|
Sponsored Links (Register now to hide all advertisements) |
|