What IS The Correct Radiator Cap Pressure For 1966 Toro?

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Otto Skorzeny
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What IS The Correct Radiator Cap Pressure For 1966 Toro?

Postby Otto Skorzeny » Mon Mar 03, 2014 10:12 am

The Owner's Manual says zilch about it. The FSM beats around the bush without specifically listing a required specification. Here is the only relevant quote I could find in the FSM in regard to testing a radiator cap:

If cap fails to hold pressure within the range of 12-15 psi, replace the cap with one that will hold the proper pressure.

The reason I question this is because every cap listed in Rock Auto under '66 Toronado is a 16lb cap (except one which is 15lb). It seems to me if the range for testing is 12-15, then 16 is too great. A 13 pound cap might be more appropriate.

Both my Cadillac and F100 specify a cap pressure rating of 12-15 lbs so I've elected to use 13 lb caps on both vehicles. Should I buy a 13 pounder for the Toro or leave the 16 lb cap in place?

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Doc Hubler
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Re: What IS The Correct Radiator Cap Pressure For 1966 Toro?

Postby Doc Hubler » Mon Mar 03, 2014 11:55 am

I would go with your 13 lb cap. Most auto store suppliers just list all models as using a particular component, for example the brake linings. The brake linings on a Toro are very specific for the front brakes, and you probably need to get them from Fusick. Go with what the manual tell you, not what Rock Auto marketing tells you.

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Otto Skorzeny
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Re: What IS The Correct Radiator Cap Pressure For 1966 Toro?

Postby Otto Skorzeny » Mon Mar 03, 2014 12:44 pm

I was leaning that way. I'll replace the 16lb cap that's on it with a 13 lb cap.

As for brake shoes, I can have the current shoes relined if necessary to make sure they are correct.

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69W34
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Re: What IS The Correct Radiator Cap Pressure For 1966 Toro?

Postby 69W34 » Mon Mar 03, 2014 6:31 pm

I would be inclined to use the recommended 15/16# cap, the reason for this is the boiling points.
The higher cap pressure increases the boiling point of the coolant most engines run 195 deg thermostats. So your running 17 deg's below 212 (at atmosphere) the 16# cap along with 50/50 mixture water/anti-freeze raises the boiling considerably the number eludes me at this point but I think its some where in 230 /235 deg's range. Now you working with 40 deg temperature spread.

I personal would be taking the risk ... i will concede though if your cooling system is leak prone i understand the caution --But yeah if you dealing with issues of that nature maybe its time to deal with them.
just an opinion nothing more.
Bill
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Otto Skorzeny
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Years Owned: 1966 Toronado

Re: What IS The Correct Radiator Cap Pressure For 1966 Toro?

Postby Otto Skorzeny » Mon Mar 03, 2014 8:45 pm

I'm not having any problems with overheating or leaking. The gauge stays right at about 1/4.

It puked out a small amount of coolant at a gas station on my drive to Chattanooga yesterday but I think it was just finding it's level. I think it had been over filled by the previous owner.

When I checked this morning it was at what I consider to be a normal level for cars of this vintage without overflow tanks- about 1 1/2 -2" below the filler neck.


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