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  1. NHGuy

    TB IV Module

    There's a TB IV ignition module on CL New Hampshire right now. Poster does not state which engine it is for or other details. But there is contact info if you want to check. http://nh.craigslist.org/boa/4725924479.html
  2. NHGuy

    Alternator?

    I'm seeing only 12 or 11.8 volts for a few minutes sometimes on the first start of a day. Then after a warmup I will bring it on plane and the voltage will pop back to normal. The other night I did this and it didn't go to normal as quickly as it has been. That was the first time I've cold...
  3. NHGuy

    Upper drive gear shimming

    I replaced the input shaft and yoke on my 88 Alpha 1, 2 years ago over the winter to correct an upper seal leak. I used a new old stock shaft which apparently has been superceded, don't have the part number in front of me, but perhaps that's a factor. Fussed with the rolling torque and got it...
  4. NHGuy

    How does TB IV advance?

    So I was trying to understand how a Thunderbolt ignition system advances and I can't work it out in my (small) brain. If the distributor and the cam have a 1 to 1 relationship how can the amplifier add advance? Does it cause the coil to fire stronger &/or earlier to make the spark jump ahead...
  5. NHGuy

    routing lines in the engine bay

    What's the best way to route the power steering lines in my engine compartment? The last time I had them off I ran the pressure line along the starboard edge of the intake. Is there any "best" routing?
  6. NHGuy

    Running on a stand

    I'm about to run my 5.7 Thunderbolt IV carburetor motor out of the boat on a stand. I will be running in a new cam and flat lifters. Do I need a tach hooked up? Seems to me I remember someone had a problem with his motor not running without the gray wire attached. I have a little tach, a...
  7. NHGuy

    Draining an Alpha 1 on a short stand

    Just had a small victory and thought someone might be able to use my method. It ain't rocket science, but if I can save somebody having to clean up spilled gear lube, then I've done my part. Pete
  8. NHGuy

    Who knows 5.7 Performance stuff? Cam Choice...

    Hi, My boat is fairly light for it's power and I want to try to get all the oomph I can out of it. I don't have to, I just want to! The engine is a 1988 5.7 serial # with the 64cc combustion chambers. 2 years ago I tested the compression and got 170 to 185. So at that point it was still tight...
  9. NHGuy

    Thank you

    To all of you who add your knowledge and experience I just want to thank you. I've been on this forum for about 5 years and it's been invaluable to me. I'm a do it myselfer, and I work the service counter at an auto and tire company. I wish I could express the joy I am getting this sumer of...
  10. NHGuy

    470 outdrive whine ? 1987 alpha

    Re: 470 outdrive whine ? 1987 alpha All you change with the trim is the drive angle. You say you can make the whine come and go. It's possible the upper input shaft gear cluster has fore & aft movement in it. I'd pull it to check. If you have the rolling torque gear set it might not be all...
  11. NHGuy

    1984 5.7L thunderbolt 4 timing chain question

    Re: 1984 5.7L thunderbolt 4 timing chain question
  12. NHGuy

    Suddenly no oil pressure

    I have run the boat all of 30 minutes this season. 25 minutes from the launch ramp to my slip at around 2500 rpm. And today it was beautiful out so my daughter and I thought we would go for a ride. Normal start, ran it up to 2500 or 2800. The water was so smooth, so I gave her some gas...
  13. NHGuy

    Power steering fluid leak

    Mercruiser 5.7 Alpha One, OC417576. I just took my first lake test of the year & when I got back I gave her a good look over. I found some PS fluid on the motor so I started looking, I found a bit on the assist unit so I gave it a wipe and tested. I find that with the motor off, if I turn...
  14. NHGuy

    trim retracts 3.5" less than it should, Alpha 1

    I was putting the drive on today and found the trim would not go all the way down. Took the rams back off to be sure it was not the drive holding up, but that went down fine. I tried exercising it a little but no luck. Comes to the same spot and halts every time. When it stops it makes the...
  15. NHGuy

    Alpha 1 drive gear sticking

    I am trying to remove the drive gear from my upper. I need to check whether my drive has the small spacer, which I should have checked before. I put in a new inner yoke last season and used the 6 to 10 inch/lb rolling torque when setting it's preload. Last summer my drive had a bit of gear...
  16. NHGuy

    rear mounts

    Can I change some rear engine mounts on an alpha 1 with a portable ball joint press? Or will it require a "real" floor standing unit?
  17. NHGuy

    You guys have changed me...

    I've been working on reupholstering my boat. It's coming along slowly since I have not ever been trained in sewing, just watched my mom & gramma do some sewing when I was a kid way back. Then some videos recently. I'm still down on the beginning of the learning curve but I'm improving and...
  18. NHGuy

    Estimating Upholstery Material

    So next project is to recover the interior of my boat. I already had a sewing machine. I have watched some videos, bought some heavy duty thread and some #16 needles. I brought home a few swatches of vinyl, the machine sews it fine. I removed my boat interior and brought it in the basement...
  19. NHGuy

    Alpha 1 upper gear shimming

    I put a new input yoke on my drive last winter because it had a rough seal surface. It would not hold pressure. Now the drive whines more than before. I thought that since I was using the same gear cluster there would be no need to redo the shims. Apparently I am wrong. I thought that since...
  20. NHGuy

    Alignment issue

    Hi, Alpha 1, Mercruiser 5.7 LX with an alignment question. I have the motor out for some gaskets right now and I'll be reinstalling it in a couple of days. Before I removed the engine I had to put my front mounts all the way down to get the alignment bar in, so that's what I did. I'd have...
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