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Old 04-28-2012, 07:16 PM   #1
biggziff OP
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Need a spark plug boot/cap

I have this old boat with a Volvo 4cyl engine in it. Tonight one of the plug wire boots broke. They're straight plug caps that attach to the plug on the threaded terminal of the plug. There's a little piece of spring steel in there that clicks down onto the threads of the plug terminal. I need one of these and can't seem to find them anywhere. Yes, I can buy a wire with ends on it that attach to the top of the plug that has the nut piece threaded on, but I was hoping to keep all the plug wires the same for now.

Any ideas??

thanks
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biggziff screwed with this post 04-28-2012 at 08:00 PM
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Old 04-28-2012, 10:48 PM   #2
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First, buy a proper automotive ignition strip/crimp tool that looks pretty much exactly like this:


You can buy replacement spark plug boots most anywhere, but I would suggest to see if you can just pull your old boot apart, pick the broken wire out, enlarge the terminal and re-crimp. Use some WD40 on the boot to help it come apart. If you oil them they slide apart pretty easily but if you try doing it dry it will usually fight you tooth and nail and maybe even commit hara-kiri instead of letting you win.
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Old 04-28-2012, 10:54 PM   #3
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Are your boots rubber or bakelite? Also, if the connector is messed up you can thread a spark plug barrel nut and just use a conventional push on connector on that plug.
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Old 04-29-2012, 05:31 AM   #4
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They're Bakelite and they screw into the center of the wire. No crimps. I know I can change the ends. I'd prefer to find the same end as I have now if possible.
Thx
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Old 04-29-2012, 07:10 AM   #5
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I've done boats and even rebuilt carbs for something like you have. Don't remember exactly what it was now. Was twenty years ago.

Nobody has yet told you what it is you need. I find this pretty standard around boats. People think they can do shoddy work on boats for some reason. Is this electronic ignition? If not it is pretty easy. Measure the ohms of one of your working plug wires and make sure you end up with something close to that. If it is electronic ignition I suggest you get an OEM plug wire and if possible a full set.

The function of the wire is much more important than what it looks like.

And if these wires are old enough to start falling apart I suggest you put some money in it before you get beyond paddle distance from shore.
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Old 04-29-2012, 09:05 AM   #6
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Yes, test all the wires with the Ohmmeter. Just found a bad one on my bike, still tested OK when the wire was bent as it sits in operating position, sure did not when I layed it straight and tested again.

Then I rechecked all of them and found another one acting that way.
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Old 04-29-2012, 09:08 AM   #7
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I've seen NGK caps at Fleet Farm. Is it a resistor cap? Lots of variables man.
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Old 04-29-2012, 11:10 AM   #8
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Quote:
Originally Posted by biggziff View Post
They're Bakelite and they screw into the center of the wire. No crimps. I know I can change the ends. I'd prefer to find the same end as I have now if possible.
Thx
Wow, these things used to be available everywhere. Not so much any more I see.

However, Dennis Kirk seems to have a few, maybe you can find one here that matches the others:

https://www.denniskirk.com/search/spark+plug+cap.q
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Old 04-29-2012, 11:52 AM   #9
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many odd things marine may be found here

http://ww2.sierramarine.com/sierra/c...a/category.asp

Rod
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Old 04-29-2012, 05:32 PM   #10
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Quote:
Originally Posted by GreaseMonkey View Post
Wow, these things used to be available everywhere. Not so much any more I see.

However, Dennis Kirk seems to have a few, maybe you can find one here that matches the others:

https://www.denniskirk.com/search/spark+plug+cap.q
Thanks...I did look there. All they have are for terminal stud not threaded terminal. I'll probably just have to get a new wire and thread a stud on the plug and call it good.

thanks
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Old 04-29-2012, 05:32 PM   #11
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Quote:
Originally Posted by D.T. View Post
I've seen NGK caps at Fleet Farm. Is it a resistor cap? Lots of variables man.
No idea...there is no need for resistor on this boat so anything will work.

thanks
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Old 04-29-2012, 05:33 PM   #12
biggziff OP
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Quote:
Originally Posted by disston View Post
I've done boats and even rebuilt carbs for something like you have. Don't remember exactly what it was now. Was twenty years ago.

Nobody has yet told you what it is you need. I find this pretty standard around boats. People think they can do shoddy work on boats for some reason. Is this electronic ignition? If not it is pretty easy. Measure the ohms of one of your working plug wires and make sure you end up with something close to that. If it is electronic ignition I suggest you get an OEM plug wire and if possible a full set.

The function of the wire is much more important than what it looks like.

And if these wires are old enough to start falling apart I suggest you put some money in it before you get beyond paddle distance from shore.
I hear ya...I may just spring for a set of wires and be done. These wires ohm out perfectly so I hate to throw them away.
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Old 04-29-2012, 06:08 PM   #13
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mebby a automotive wrecking yard... an old one... or possibly a vintage Volvo site. That cap is probably the same as what came on the 544, 122, 144, and 1800 series cars with B1800 and B2000 engines. The same engines were adapted and used extensively in marine applications.
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Old 04-29-2012, 07:55 PM   #14
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Is this what your looking for???

Or this???



http://www.beruparts.com/product.sc;...&categoryId=11
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Boatman screwed with this post 04-29-2012 at 08:11 PM
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Old 04-29-2012, 08:56 PM   #15
biggziff OP
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Quote:
Originally Posted by Boatman;185740

Or this???

[IMG
http://www.beruparts.com/images/1230575174031-380478219.jpeg[/IMG]

http://www.beruparts.com/product.sc;...&categoryId=11

WINNER!!!!!!

thanks much!
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