Two new radiators, still overheating

bevans6 · October 28, 2014, 04:56:09 AM

The air pressure for the belt tensioning cylinder is set by a pressure regulator just in behind the belts on my MCI. There is a valve that turns the air on and off, or releases it completely, and the pressure regulator is right beside it, then the hose goes to the air cylinder so you can trace it back. My manual specs out a Williams WM-279-E1 regulator set at 21 psi.

Brian

Scott & Heather · October 28, 2014, 05:52:59 AM

Ok thanks Brian. I'll check that today. Eagle, I added 4 total not 7. Sorry for the confusion

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Ace · October 28, 2014, 10:48:44 AM

Run it up to temp it in your case above and let it sit overnight and top it off. It should be ok and any air pocket will have risen to the highest point.
Worked for me!

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B_K · October 28, 2014, 11:12:43 AM

OK Scott several things come to mind here.

1st off as Yoda 1st mentioned it's most likely an air pocket.
Now you may have already burped that pocket out. But just to be sure check all over the top of your engine and see if any of the crossover pipes have petcocks in them. (usually pointed straight up)
If so run it up to temp then carefully open the petcocks and see if just coolant comes out or air, or both. I usually do this 2-3 times after draining and refilling one so as to be sure all air is out.

2nd you mention that you have to pull on your belt tensioner to get it to come tight? there is a problem there.
It could be as simple as the valve accidentally being in the position. But more than likely the valve, regulator, cylinder, or pivot points are the culprit.
If it is a valve or regulator you should be able to determine and fix fairly easy. (rebuild or replace)
If it's the cylinder they can be rebuilt, replaced or eliminated. (a proper size turn buckle solves the whole air problem and is tight all the time!
If it's froze up pivot points then you have to do some dis-assembly and get them freed up. Then as you put them back together grease the snot out of them! (they should have grease fittings already on them but are very commonly over looked by many "mechanics" when servicing!)

Also mentioned we the fans and seals which of course can leak and be part of the problem.
And yes even the water pump can play into all this too.

BK

Scott & Heather · October 28, 2014, 12:34:51 PM

Ok. Thanks again gents. I have been driving today. Warmed it up to temp and let cool several times and added water/coolant. So far, since initial fill of coolant system post radiator install, I've put in 7 gallons now total. So yeah, it was thirsty. Air pocket I'm sure like most of you have suggested. It's now running much cooler. A coupe times its approached 200 but hasn't actually reached it. Going to let it cool again and see if I can add more coolant. Radiator seals are solid now and I'll be checking the fan belt air cylinder

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Scott & Heather · October 28, 2014, 02:35:30 PM

Ok. Things are definitely better. Must have been air. Freaked
Me out. I'm a self proclaimed bus hypochondriac....

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Lostranger · October 29, 2014, 05:35:04 AM

Quote from: Scott Bennett on October 28, 2014, 02:35:30 PM
I'm a self proclaimed bus hypochondriac....

Glad that worked out, Scott. Even though i know better, part of me assumes a blown engine or transmission at the slightest noise or vibration.

Maybe they have a program for me at the Henry Ford Clinic.

Scott & Heather · October 29, 2014, 05:51:28 AM

Lol. If they started a program like that, I'd be attending alongside you. I think gumpy mentioned that your rads are sealed pretty good if you can do this...and btw, this rag was wet and heavy:
https://vimeo.com/110357423

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luvrbus · October 29, 2014, 06:01:08 AM

Now you have all the air from the system let the level find it's happy place and keep it there or you will be adding coolant all the time because it will just blow it out till it finds the happy place it likes

Scott & Heather · October 29, 2014, 03:24:24 PM

Advice taken. Will do...

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Dave5Cs · October 29, 2014, 07:30:25 PM

I use 40 weight!....

solodon · October 29, 2014, 07:39:58 PM

The 1989 service manual for MCI MC9 calls for 10W40 for the power steering system.
Don

Scott & Heather · October 30, 2014, 04:14:37 AM

I'm confused

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B_K · October 31, 2014, 11:15:23 AM

Quote from: Scott Bennett on October 30, 2014, 04:14:37 AM
I'm confused

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They jest be'n smartalics!

But on that note I use Delvac 15/40 in all my buses an Sprinter Van now!
(of course all our buses now run 60 Series an the Sprinter has the 2.7 5 cyl turbo Mercedes diesel)

BK

Scott & Heather · October 31, 2014, 11:54:01 AM

you guys are killing me...