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Old 04-18-2005, 09:45 AM
MNSKier MNSKier is offline
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Changing Spark plugs on a 87 ProStar???

Can anyone offer advise on how to pull the Spark Plugs on an 87 ProStar. To me it almost looks like I have to take off the exhaust manifolds. There must be an easier way to do this job.
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Old 04-18-2005, 09:52 AM
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jsonova99 jsonova99 is offline
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Boat: 1991 Mastercraft Prostar 190
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not sure how much different an '87 is from a '91, but I used a box end wrench instead of a socket, one or two plugs were tough, but they came out with some patience
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Old 04-18-2005, 10:06 AM
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east tx skier east tx skier is offline
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Box wrench should work fine. Those rear plugs are difficult, but can be done without removing anything assuming you can dislocate your shoulder without much trouble.

But seriously, it just requires 1 beer and some foul language.
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Old 04-18-2005, 10:10 AM
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BrianM BrianM is offline
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Yep, Just used a 5/8" box wrench on my '88. Not as difficult as it looks.
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Old 04-18-2005, 10:43 AM
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east tx skier east tx skier is offline
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... just more difficult than a chevy 350.
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Previous: 1993 Prostar 205

Red 1998 Closed Bow Ski Boat, Ford 351, 310 hp, Acme 4 blade, Perfect Pass SG.

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To me, this forum is about love of inboard boats. It is about the sharing of information and, on a good day, some humor. It is not about post count, brand of boat, or any other superfluous labels that lend themselves to a false sense of superiority. Please, respect one another, try to pass on accurate information, and keep your eye on the ball.
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Old 04-18-2005, 11:06 AM
MNSKier MNSKier is offline
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Thanks Guys I'll give it a try this weekend.
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Old 04-21-2005, 01:12 PM
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Hoff1 Hoff1 is offline
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On my 90 Maristar, changing the plugs used to take about 2 hours, 6 bandaides, and a 6-pack of brews. The manifolds were in the way to prevent virtually any tool except an open faced wrench.

So, I got creative. I took a spark plug socket and cutoff about off of the open end with a hacksaw. Then, I used a large drill bit and cored into the socket to allow the spark plug to seat deeper in the socket. The plug end then sticks out through the 3/8 square opening. Then, I went and got a 19 mm combination wrench with the built in racketing box end. This allows me to change the plugs in about 20 minutes. Job still requires 2 beers though.
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