Re: [OMC-Boats] overheating - the saga continues

From: Lee Shuster <lee.k.shuster@...>
Date: Fri, 29 Aug 2008 08:41:37 -0600

Yeah, this has been yet another example of the many subtle details that
go into the "marinization" of a engine originally designed for
automotive use.


From: omc-boats-bounces@...
[mailto:omc-boats-bounces@...] On Behalf Of Don Mandelas
Sent: Thursday, August 28, 2008 6:47 PM
To: Evinrude & Johnson Boats of the 1960's and 70's
Subject: Re: [OMC-Boats] overheating - the saga continues

Thanks Jeff for keeping us updated on your saga. I'll store your
messages in my email files for future reference ( in case I have
problems with my engine overheating). I'm looking forward to hearing
about the solution to your problem.
Also, Thanks for the photos of the two different styles of engine water
And, would you send a photo of inside your Engine compartment (I'd like
to see how your water hoses are connected) ?
> here's today's adventure for those who care. swapped out one water
> pump for another - overheating problem "seems" to be WAY better.
> atleast with heat sensing gun. gauge reads hot, but gun shows
> otherwise. and while gauge shows 200+, manifolds only feel warm at
> best. so gauge is off. all this testing was done while outdrive
> was off, disassembled in garage. testing with hose and no
> outdrive after putting on different water pump seemed to show temp
> staying where it should. but again, just on hose. So outdrive got
> assembled, put back on, and down to the river me and mechanic
> assistant went to see what heat gun would show while underway. only
> to find that the temp needle immediately moved up to 200+ within
> seconds at idle. clear tubing showed no water really being
> pumped. so apparantly, something wasn't put back together properly
> with the outdrive. what a waste of time. mechanic asst did that
> part. tomorrow it gets disassembled carefully to hopefully
> visually see whats wrong. but he doesn't have a tank to fit
> stringers, so after reassembly, it's back down to the river for a
> test. and if no difference, back to shop. and so on.
> testing that outdrive is going to be a complete pain. can't hook up
> hose. no tank. this is wearing me out and costing a lot of
> time. yet i'm encouraged with the diffence the engine water pump
> made. again, feels so close to being solved.
> And the previous one? who knows where it came from or if it's
> even OMC. might be automotive. (see pix). But here's the weird
> part: my mechanic has some microfiche of early 60's OMC motors. the
> one that we put on seems to definitely be the one that's supposed to
> be on there. The givaway was that it has the main nipple for the big
> hose, but then also has a smaller 3/4" nipple for something else.
> This is fed by a bypass hole of some sort in the WP housing. Yet in
> the diagrams it shows this extra nipple capped off! So that's what
> we did. capped it off. so now it does nothing, just like it's
> supposed to. So why is it there? what was it for - some factory
> option or something? Air conditioning? Fresh water for a live
> bait well? (kidding). here are the photos of before and after
> water pumps. the bad one that was on there is the one with the
> straight impeller blades. anyone have the first one? is it OMC?
> jeff


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Received on Friday, 29 August 2008

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