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1950 U22 Mercruiser 302 overheating

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dmcmillan
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1950 U22 Mercruiser 302 overheating

Post by dmcmillan » Sun Jun 24, 2018 9:06 pm

There was an issue overheating when we first got underway this weekend. The temperature gauge went over 200 and she died. I shut her down, waited an hour while the kids swam, and tried again without an issue. The motor was newly rebuilt in 2013 and we've never had an overheating issue with her before. I know there is a valve under the motor that enables a test on dry land, but I'm not really sure if this is the best idea to try first. Thank you for any direction on the subject.

jfrprops
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Re: 1950 U22 Mercruiser 302 overheating

Post by jfrprops » Mon Jun 25, 2018 7:43 am

I would bet your thermostat was stuck... and she did not get all that hot.....go boating....John in Va.
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

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drrot
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Re: 1950 U22 Mercruiser 302 overheating

Post by drrot » Mon Jun 25, 2018 8:47 am

Could need new waterpump impellers.
Jim Staib
www.finewoodboats.com


1947 Penn Yan 12' Cartopper WXH474611
1950 Chris-Craft 22' Sportsman U-22-1532
1957 Chris-Craft 26' Sea Skiff SK-26-515
1968 Century 17' Resorter FG-68-174

dmcmillan
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Re: 1950 U22 Mercruiser 302 overheating

Post by dmcmillan » Mon Jun 25, 2018 9:42 am

John,
Thank you for the thermostat idea. BTW, my wife and I bought our marriage license at the Powhatan courthouse twenty years ago! Small world!

Jim,
Thanks for the impeller idea. I will check.
Dave

jfrprops
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Re: 1950 U22 Mercruiser 302 overheating

Post by jfrprops » Mon Jun 25, 2018 10:31 am

Dave, sounds like you were OVERHEATED in Powhatan 20 years ago too!
Did you live around here?
Do, of course, check the impeller right off...but if she did not overheat on the restart...doubt that is the main cause....
John in VA
1980 Fairchild Scout 30
19?? custom Argentine Runabout 16'
1954 Whirlwind deluxe dual ckpt 16'
1921 Old Town Charles River 17' (founding Captain, James River Batteau Festival)

dmcmillan
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Joined: Wed Jun 25, 2014 7:56 pm
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Re: 1950 U22 Mercruiser 302 overheating

Post by dmcmillan » Fri Jun 29, 2018 7:17 am

I did, indeed, get 'overheated' twenty years ago in Powhatan!
Still an excellent choice and she loves woody boating to boot!

Jim, it was a bad impeller ( 5 of 8 flaps were gone), so this forum proves it's worth in my eyes once again.
Please enjoy your weekend and thank you again for the good advice.

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