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Coolant pushed out overflow tube - more when revving. Explanations? #5454258 06/15/20 09:13 AM
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OceanRuns Offline OP
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Went to look at a 1972 Ford Econoline Van. The engine is either the 351 or 302 (owner unsure, in 72 it would I believe it would have been a 302, but may have been changed.)
A previous owner had it converted to fuel-injection using an FiTech kit. Started fine, seemed to run well.
Did a low speed test dive around the neighborhood, and idled it, probably on 15-20 minutes total run time.

Noticed coolant coming out of the overflow tube (there is no overflow tank). When I revved the van, the amount increased. I repeated this cycle a few times. There is a digital temperature display with the fuel-injection kit, and it showed the temp in the 166-172 range.

I checked the radiator about 15 minutes after shut-off. Coolant level was to the top. I had checked the coolant before when it was completely cold, and the level had been about an inch lower. Coolant looks clean. There was some debris, but didn't look like oil. Looked to be some old radiator gunk (radiator is old).

So, are there explanations for this other than a head-gasket? Or does that seem the most likely?


Last edited by OceanRuns; 06/15/20 09:15 AM.
Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454269 06/15/20 09:22 AM
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The older cars needed about at least an inch of air in the tank, 2 to 4 inches is cross flow radiator, to allow for expansion. If it seeks it's level, it is probably OK.

Rod

Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454317 06/15/20 10:10 AM
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mk378 Offline
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Engine cold, open the radiator cap to release any pressure then replace it. Squeeze the top radiator hose to feel the pressure inside. Start the engine and rev it and feel for pressure again. If pressure builds up before the engine significantly warms up, blown head gasket.

It is easy to retrofit an expansion tank like newer cars had-- that mod is worth doing.

Last edited by mk378; 06/15/20 10:12 AM.
Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454352 06/15/20 11:06 AM
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CT8 Offline
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Have you checked the rad cap and this could be normal as explained in an above post.


2015 F150 2.7
2018 F350 6.2
Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: mk378] #5454593 06/15/20 05:03 PM
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SpitFire6 Online Content
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Originally Posted by mk378
Engine cold, open the radiator cap to release any pressure then replace it. Squeeze the top radiator hose to feel the pressure inside. Start the engine and rev it and feel for pressure again. If pressure builds up before the engine significantly warms up, blown head gasket.

It is easy to retrofit an expansion tank like newer cars had-- that mod is worth doing.


Do not confuse Expansion vessel with Overflow vessel. They both might replenish the main system on cooldown but are totally different.


2002 206 CC 2L 4Cyl. 0W40 FS
1972 Spit 2L5 6Cyl. 0W40 FS
Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454604 06/15/20 05:13 PM
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mk378 Offline
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Yes there are two versions of the plastic coolant tank. I think the official name of the system introduced in the late 70's and almost immediately used by all manufacturers, where the radiator cap regulates flow in and out of the tank, is a "recovery" tank. The tank is not under pressure.

Much newer cars went to having the whole tank under pressure at the top of the system. Usually there is no radiator cap at all. The coolant expands into the air space in the top of the tank like it would with the air space in the top of the radiator of a car with no tank.

Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454605 06/15/20 05:14 PM
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An atypical issue i once had is the vacuum advance diaphragm had a very tiny leak so timing was not getting to normal advance. The symptom was that after driving a bit then stopping at light the overflow would dump some coolant. Found it by pilling a vacuum on it and seeing it slowly drop.

Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454616 06/15/20 05:29 PM
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Kuato Offline
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Possibly head gasket.


Thick vs Thin test still in progress.
Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454639 06/15/20 05:55 PM
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Propflux01 Offline
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Run it with the cap off and see if it bubbles.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5454848 06/15/20 10:20 PM
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OceanRuns Offline OP
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Thanks for the suggestions. I have a few things to try now.

Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: Kuato] #5455376 06/16/20 04:02 PM
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stroked93 Offline
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Originally Posted by Kuato
Possibly head gasket.


This

Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5455647 06/16/20 10:07 PM
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OceanRuns Offline OP
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Is there anything else that could reasonably cause coolant to come out the overflow tube at a faster rate when revving than when idling?

Re: Coolant pushed out overflow tube - more when revving. Explanations? [Re: OceanRuns] #5455782 06/17/20 05:36 AM
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Propflux01 Offline
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A water pump might, but I'm still betting on the bubbles and head gasket.


2014 Hyundai Elantra
2014 Hyundai Elantra GT
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