September 11, 2018 at 12:44 am #17286
I recently bought two Mercruiser 470s from a shrimper, here in south Louisiana. I got a great deal on them, as they both came with outdrives, controls, risers, heat exchangers, etc. I was informed that they were complete, running sets that were recently taken off the shrimp boat because they were going to diesel. I paid $500. The guys bench tested one of the engines for me before I bought them, and it started up – although it ran pretty rough, bouncing around a lot on the ground.
I’ve read a little bit about these motors and boaters seem to have a love/hate attitude towards them. Obviously, I should get the alternator kit, and probably upgrade to the 4″ heat exchanger, but, what else, while I’ve got these on the ground with 360 degree access, should I do? I know about the weep holes and I’ll check that out – heck, I’ll probably just go ahead and change the seals, for good measure.
Any suggestions will be appreciated. I’m getting the feeling from reading other boaters’ stuff that these can be a little finicky… I’m hoping and praying I got as good a deal as I thought (and was told) I was getting.September 11, 2018 at 5:04 am #17287
Replace the points with the pertronix ignition module and never have to worry about mechanical points. http://www.pertronix.com/September 11, 2018 at 12:59 pm #17288
will do… thxSeptember 11, 2018 at 4:35 pm #17289
Also – some key points – excuse the pun.
Exhaust riser / Elbow – needs to be checked to ensure its not failed internally and allows water in the the bores.
Check weep hole on timing cover is clear of obstruction and does not weep coolant as that indicates the cam seals have either failed or grooved the cam.
3 inch heat exchanger is beneficial.
I am in the process of rebuilding one right now.September 11, 2018 at 5:45 pm #17291
Sounds like you got it covered. I would probably replace the cam seals while you have access, more work but it pays off in the long run.September 11, 2018 at 8:28 pm #17292
I will definitely put new seals in while it’s out.
Rake, are you saying I should keep my 3″ heat exchangers? I have read that the 4″ was a great improvement and that it was suggested to upgrade to the 4″. If there is a benefit to the 3″, I would not be opposed to keeping them.
Does anyone know of a simple way to, once they are removed, plug the risers and do a pressure test on them? I tried it once with the risers from a 7.4L Mercruiser, but I’m really not sure we got true readings on that test.September 11, 2018 at 8:34 pm #17293
When I go to the ignition module page at pertronix, I get a bunch of pages of results. I know I don’t want 6 cylinder, so that rules out a couple pages. However, since the 470 is half of a Ford v8, do I want that one, or do I want one of the 4 cyl modules?September 12, 2018 at 4:43 am #17294
The Pertronix Ignitor for the 470 is located on page 25 of the following catalog –http://www.pertronix.com/catalogs/pdf/ptx/2018/Pertronix2018.pdf. It is part number 1146A. Be very careful when you install the plastic magnet ring over the points cam. If you push it too far you will break out the plastic on the top of the ring. With the ring started on the distributor cam, put a washer on the protruding distributor shaft and push the magnet ring down with the washer. This ignitor is for the Delco distributor and NOT the earlier PRESTOLITE distributor.
You want the 4″ heat exchanger
- This reply was modified 11 months, 2 weeks ago by stractor.
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