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View Full Version : Spark plug gap? And how the ?!@@# do I get 'em out?


torbmi
03-31-2005, 08:25 PM
I have an '89 Tristar 190, Ford, Indmar. What is the gap on the plugs, and how in the world do I get them out? There seems to be no room. Thanks.

torbmi
03-31-2005, 08:26 PM
Oops. It's a 351.

Larryp
03-31-2005, 09:03 PM
New here too, but I enjoy this board. Anyway you might try a spark plug socket with a wobble. As far as gap, call the dealer, they'll tell you.

JimN
03-31-2005, 09:46 PM
Gap should be about .035" and you can use a box wrench. It's not limited to the length of the socket that way.

east tx skier
03-31-2005, 10:12 PM
.035 on my 93 351HO. Aren't Ford's fun. Chevy's are much easier from the looks of it.

sfitzgerald351
03-31-2005, 10:58 PM
Are the plugs really that hard to get out of the 351? I have a 351 in my 1992 Ford Bronco and although the right rear plugs are a pain, it's because I can't get my hand and socket in the right location easily because of the A/C unit. With a boat I'd think it'd be easy. What's in the way, the exhaust manifolds?

MYMC
04-01-2005, 09:02 AM
Easy & inexpensive...buy a Craftsman spark plug socket, they have a 5/8 wrench flat on the end, use a wrench to turn the socket. No broken plugs and takes care of clearance issues. .035 is the gap.

djhuff
04-01-2005, 09:21 AM
Scott, I had the same problem on my Bronco. PITA. Not looking forward to doing it again.

Tom023
04-01-2005, 09:34 AM
/Hijack/

Remember the Chevy Monza? You had to lift the engine to change the spark plugs!

/End Hijack/

BrianM
04-01-2005, 11:07 AM
.035 on gap. I was able to use a spark plug socket on 2 of them and the rest I just used a box wrench. It is actually pretty easy.

east tx skier
04-01-2005, 11:55 AM
The rear starboard plug on the 351 is a PITA. The rest aren't so bad. On the Chevy 350, they look to be all in plain view. I usually end up using a box wrench on just about all of them rather than switch back and forth between that and the socket.

Hunterb
04-01-2005, 12:38 PM
I just use a 5/8" box end wrench on all of them. You can use a socket on the driver's side front and passenger side rear plugs but it's just as easy to use the wrench. As for the gap, if your motor has been converted to electronic ignition then you may want to gap a little wider than stock, otherwise .035 will work fine.

Bruce

rasmithaz
04-01-2005, 02:12 PM
I just use a 5/8" box end wrench on all of them. You can use a socket on the driver's side front and passenger side rear plugs but it's just as easy to use the wrench. As for the gap, if your motor has been converted to electronic ignition then you may want to gap a little wider than stock, otherwise .035 will work fine.

Bruce
I'm dealing with this gap issue today. my boat came standard with prestolite electronic ( 93 351 ho) ignition. I have been told before that the spark plug gap should be .045 for complete cumbustion and the stronger power from the electronic ignition can provide the energy to fire the wider gap.

east tx skier
04-01-2005, 02:26 PM
I'm running the same setup. My manual lists the gap at .035 for the 351 HO. Also running the prestolite electronic ignition.

JohnnyB
04-02-2005, 12:03 AM
A spark plug socket and separate universal is too long to get under the exhaust manifolds. However, craftsman makes a spark plug socket with an integrated universal that works very well for removing plugs on 351 Fords. I used to use a box end which is definately a PITA....this is much easier!!!

skee
04-07-2005, 08:42 PM
torbi i have a 351 indmar in my boat and i find it easiest to use a box end wrench. It should be 5/8"...

jsonova99
04-07-2005, 09:44 PM
I used a box wrench, I found that there was only one bad plug to get out because of the brackets holding the water inlet hose. I went with .035 gap and mine is ran like a champ

Mag_Red
04-07-2005, 09:52 PM
Just make sure not to over tighten (http://www.tmcowners.com/teamtalk/showthread.php?t=2334) it! ;)

6ballsisall
04-07-2005, 10:23 PM
I used a box wrench, piece of cake! .045 seems awful far!

86PowerSlot190MC
04-08-2005, 09:23 AM
A spark plug socket and separate universal is too long to get under the exhaust manifolds. However, craftsman makes a spark plug socket with an integrated universal that works very well for removing plugs on 351 Fords. I used to use a box end which is definately a PITA....this is much easier!!!

I used the exact same thing on my 351. All done in 20 mins, well apart from the little fact it took me another 30 to figure out which cylinders the front plug wires when too!!!

jimmer2880
04-08-2005, 02:56 PM
You may also want to try a spark plug socket with a ratcheting wrench.