Author Topic: coolant hose and o-ring replacement  (Read 381 times)

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Offline John_Atkinson

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coolant hose and o-ring replacement
« on: June 18, 2018, 02:52:49 pm »
getting ready to do some long-overdue maintenance including replacement of all coolant hoses...as I recall there is also an o-ring that should be done at the same time.

Can anyone shed some light on this and also are there any tips/tricks I should know?

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Re: coolant hose and o-ring replacement
« Reply #1 on: June 18, 2018, 03:42:14 pm »
Two on each of the coolant logs and one for the thermostat.

I found it less frustrating to remove the headers and
carbs before starting.

Have the carbs rebuilt while they’re out.

Offline Pbfoot

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Re: coolant hose and o-ring replacement
« Reply #2 on: June 18, 2018, 03:43:12 pm »
Coolant log o-rings front and rear.  The thermostat o ring is known to turn to goo as well. The bad news is the exhaust and carbs will need to be removed to access them. Many owners fabricate a heat shield to protect the front radiator hose from the exhaust. I have seen a few threads where the log o rings were replaced without removing the exhaust and carbs but I don't know how they cleaned the corrosion. I like to put vegetable oil on the o rings so they don't fold or tear on installation. 
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Offline JPD

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Re: coolant hose and o-ring replacement
« Reply #3 on: June 18, 2018, 05:13:03 pm »
I was able to do mine without removing the headers, but you do have to remove the radiator and the oil lines to the head. There are 2 seals for the thermostat. one to the cooling log and the one for the thermostat. The one for the thermostat is the one that was all goo.  I replaced my thermostat at the same time.  I had the carbs out to SISF so they were out of the way. +1 for lube on the o rings when you put them back in. I also put a little on the port where they are inserted. Go slow and make sure the o rings do not pinch or roll out of position.

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Offline Derick

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Re: coolant hose and o-ring replacement
« Reply #5 on: June 18, 2018, 08:19:18 pm »
I was able to do mine without removing the headers, but you do have to remove the radiator and the oil lines to the head. There are 2 seals for the thermostat. one to the cooling log and the one for the thermostat. The one for the thermostat is the one that was all goo.  I replaced my thermostat at the same time.  I had the carbs out to SISF so they were out of the way. +1 for lube on the o rings when you put them back in. I also put a little on the port where they are inserted. Go slow and make sure the o rings do not pinch or roll out of position.

Yup this all the way. Got into it earlier this year. Use some vaseline to aid in the coolant hose installation, especially on the hose inside the exhaust (if you choose not to remove it, I didnt). Good time to ship off the carbs and do the tstat, as others have said. Your time is hopefully worth the money you'd save tearing it all down again just to do the tstat, or the coolant logs.
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Re: coolant hose and o-ring replacement
« Reply #6 on: June 19, 2018, 12:27:55 am »
vaseline eats/destroys rubber...

many people found this out, the hard way... children being born during the 70's, and some dreadful disease we still have today. :-\
just use some motor oil, and very little of that, in fact..

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Offline Bob H

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Re: coolant hose and o-ring replacement
« Reply #7 on: June 19, 2018, 12:58:25 am »
Vaseline and latex definitely don't go well together, with serious results! :'(
.
Correct me if I'm wrong, but I believe Vaseline is petroleum jelly, and the "O" rings are probably nitrile rubber, which definitely do go well together.
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Re: coolant hose and o-ring replacement
« Reply #8 on: June 23, 2018, 09:11:04 pm »
Might want to get a few extra log rings than you need.  Even with clear access it's easy
to pinch those little buggers... 
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Offline JimBob

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Re: coolant hose and o-ring replacement
« Reply #9 on: June 29, 2018, 02:44:11 am »
Might want to get a few extra log rings than you need.  Even with clear access it's easy
to pinch those little buggers...


+1


I’m good at this stuff, super careful, very procedural. And I pinched an o-ring on the log.


Get spares. A few extra $ for insurance that you can complete the job.

Offline WillyP

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Re: coolant hose and o-ring replacement
« Reply #10 on: June 29, 2018, 12:39:16 pm »
Modern o-rings are "probably" resistant to Vaseline, but why take the chance?
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Re: coolant hose and o-ring replacement
« Reply #11 on: June 30, 2018, 02:59:00 pm »
I use a solid stick of silicone to lube up stuff like that. No problems yet.
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