OPS .67 rebuild problems
#1
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OPS .67 rebuild problems
Hello every one. I have a question. My brother just bought a couple of boats off a guy. One is a v-hull and the other (mine) is a tri hull. They both are sporting OPS .67 engines. On my brothers v hull we had to rebuild the engine. No big deal i have done it several times in nitro cars and trucks. Any way when we go *** together it seems to be super tight when the piston gets to the top of the cylinder. Im talking so tight that the only way it cranck over is with the glow plug out. The ops .67 motors are some what older, probaly from the 80's. My boat runs great, we just cant get his to start due to it being so tight. Any ideas.
Thanks,
Goesman
[link=http://goesworkshop.com]goesworkshop.com[/link]
Thanks,
Goesman
[link=http://goesworkshop.com]goesworkshop.com[/link]
#2
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RE: OPS .67 rebuild problems
A freshly rebuilt motor will be tight at the top end because piston sleeves are taper bored, very few have a straight bore. As the motor gets broken in or warmed up once it's been fired up, it will loosen up as the heat from the combustion will expand the sleeve. If you don't already have one, a 24-volt starter is usually needed for a large motor such as the ones that you have.
#3
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RE: OPS .67 rebuild problems
Have you heard of any one modifying brigs and straton starter motors to be used as a starter.
I will get pictures of the boats on my website today @ [link=http://goesworkshop.com]goesworkshop.com[/link]
Thanks again.
I will get pictures of the boats on my website today @ [link=http://goesworkshop.com]goesworkshop.com[/link]
Thanks again.
#5
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RE: OPS .67 rebuild problems
goesman, I checked your website out and man!!!??? You are one mighty handy guy! Bilding your own CNC-mill?! Now that´s what I call a superman...
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RE: OPS .67 rebuild problems
Thanks for the complement. I have some honda starters that i could use. I have pictrues of the boats on my website now. [link=http://goesworkshop.com]goesworkshop.com[/link]
Thanks.
Thanks.
#7
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RE: OPS .67 rebuild problems
Ok, first of, as I forgot to say earlier, is the engine that tight to rotate due to compression, or due to tight fit in the jug? And if it´s because of tight fit, than I would suggest trying to get it started with as much oilcontent as possible in the fuel, to make sure it doesn´t stick first thing. When you get it going, just let it run rich for a good while to break it in, and then start leaning it out after 3-4 tanks.
As for converting a Honda-starter, I guess the trick is to get a pulley to fit on the starters spindle, to pull a startbelt. But hey, with all of your tools, you should be able to turn down a piece of aluminuim or stell to a pulley with that lathe of yours?
And now, on to a question! On your brothers monohull, there seems to be adjustable trimtabs, am I correct? If so, could I maybe convince you to take som closeup pics of the system, and post them or email them to me? I would be most grateful for such a kindness.=)
Thanks!
As for converting a Honda-starter, I guess the trick is to get a pulley to fit on the starters spindle, to pull a startbelt. But hey, with all of your tools, you should be able to turn down a piece of aluminuim or stell to a pulley with that lathe of yours?
And now, on to a question! On your brothers monohull, there seems to be adjustable trimtabs, am I correct? If so, could I maybe convince you to take som closeup pics of the system, and post them or email them to me? I would be most grateful for such a kindness.=)
Thanks!
#8
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RE: OPS .67 rebuild problems
We can get it to crank with the glow plug out. When did that i would constantly shoot squirts of wd-40 in the plug hole. With the glow plug loose its really hard to crank. We are getting some new starter belts then we will give his starter another try. I will have my brother send me some pictures of the trim setup for you (mrchilly).
I'm going out in the shop to dig out a old starter.
Have a good one all.
I'm going out in the shop to dig out a old starter.
Have a good one all.