Boats For Sale:
Spark Plug Torque |
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Randy_in_Ohio 
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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 Topic: Spark Plug TorquePosted: October-25-2007 at 11:39pm |
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I've searched and can not find the answer to this simple question:
What should my spark plugs be torqued to? |
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87BFN owner
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Joined: August-25-2006 Location: Saline, MI Status: Offline Points: 2194 |
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Posted: October-26-2007 at 12:12am |
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I think it's a matter of personal prefference. I thread them in by hand and then put a socket on it. I would bet I never tighten it more then a quarter turn with the socket.
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M3Fan
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Joined: October-22-2005 Location: United States Status: Offline Points: 3185 |
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Posted: October-26-2007 at 12:18am |
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I basically just snug it up after screwing it in by hand to seat the plug. Hardly a quarter turn. It's a "feel" thing. I'm always liberal with the anti-seize as well.
Edit: After looking at my response, I realize I tee'd it up for HW and CQ on this one. |
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2000 SN GT40 w/99 Graphics/Gel
2016 SN 200 OB 5.3L DI https://forum.fifteenoff.com |
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87BFN owner
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Joined: August-25-2006 Location: Saline, MI Status: Offline Points: 2194 |
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Posted: October-26-2007 at 12:44am |
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I rarely have to tighten it a quarter turn unless I didn't get it tight enough by hand. I didn't mean to imply you had to tighten it a quarter turn after putting it in by hand.
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Randy_in_Ohio
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Posted: October-26-2007 at 1:52am |
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Thanks, I'll just snug them up. I know when I did the ones in my old truck they had a recommended torque, but that had an aluminum block which is probably more to stripping.
Joel, HW is going to be all over that one. 
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Hollywood
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Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13520 |
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Posted: October-26-2007 at 12:14pm |
I thought your wife was a conservative ? Blabbing about your mistress online is a bad idea! Either way, it has nothing to do with Boat Maintenance. I am glad to hear you are doing it well however.
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boat dr
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Joined: June-27-2004 Location: United States Status: Offline Points: 4245 |
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Posted: October-26-2007 at 12:35pm |
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Motors manual #41 1978 printing for years 1973/1978 says; 429/460= 15 to 20 lb. ft
302/351=10 to 15 lb. ft. Good question though,always heard when in doubt,Tighten it till it strips and back off a 1/4 turn........... |
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quinner
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Joined: October-12-2005 Location: Unknown Status: Offline Points: 5828 |
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Posted: October-26-2007 at 12:50pm |
No more spanky my wanky, donger need food! |
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Randy_in_Ohio
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Posted: October-27-2007 at 1:23pm |
So, if I have a 351 Ford from 1993 I should be able to tighten them down to ~15 lb. ft. and feel good about it? Thanks |
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Randy_in_Ohio
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Posted: October-27-2007 at 5:00pm |
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My dumb A** just went out to the garage to torque these down to 15 ft. lb. and cracked one of the plugs. i think it was because I had an extension on my toque wrench... Anyway, is it OK to just replace this one plug or should I replace all of them. I just replaced all of them last year and they still look good.
At least I didn't drop the straw from the fogging oil down the cylinder this year 
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Randy_in_Ohio
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Posted: October-27-2007 at 5:24pm |
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BTW,
I have Autolite 764 plugs installed, is this the right / good plug for my engine. This is what the previous owner installed. I'm looking in the PCM manual I downloaded and it mentions other model Autolite plugs, got me wondering... it mentions a 14mm and an 18mm ?? 
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TRBenj
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Joined: June-29-2005 Location: NWCT Status: Offline Points: 21192 |
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Posted: October-27-2007 at 7:06pm |
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Randy, which heads are on your motor? If theyre the standard E7 heads, you want Autolite 24's. If theyre the GT40 heads, then the 764's are perfect. Im not even sure if the wrong one would screw in.
You can tell which heads you have by the number of bars on the end- E7's have 2, while GT40's have 3. |
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Randy_in_Ohio
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Posted: October-27-2007 at 10:15pm |
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I think I have the GT40 heads. It has "GT" on the head and also has the three bars on the heads.
I'm guess I'm just going to pick up the one Autolite 764 to replace the one I broke. |
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Randy_in_Ohio
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Joined: September-13-2006 Location: N. Canton, OH. Status: Offline Points: 1891 |
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Posted: October-28-2007 at 12:43pm |
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I went ahead and got eight of the 764's, since they were only $1.50 each I figured I would just change them all.
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M3Fan wrote: