Losing coolant

[Pete Masterson]

I suspect that 13-15 psi caps are more common. A 7 psi cap might
actually prove to be hard to find. (I've never had a vehicle with
such a low pressure cap, except for a Model A Ford (with original
engine) I had years ago... that I don't think was pressurized at all.

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
aeonix1@...
On the road at Max Meadows, VA



On Oct 23, 2008, at 10:05 PM, Don Bradner wrote:

> The parts book that came with this coach calls for a 7 lb. I have
> no idea when this one was changed to a 13 lb.
>
> There is a thread back in March of 2007 starting with post 20947
> where Curt Sprenger said:
>
> "Coolant Pressure Control Cap...the 92 series manual recommends all
> series 92 on-highway vehicle engines use a minimum 9 psi control cap.
> My radiator cap is a 7 psi. Is this a Bluebird change? What are others
> using? Should I be concerned? The engine temperature runs at about 185
> to 195."
>
> That thread ended up being more about alarmstats, misters, etc. but
> besides you (Leroy) mentioning that you had a 13, Pete posted in
> that thread that the shop that did his radiator replaced with a 15.
>
> I'm going to guess that a higher one gets used precisely because
> the 7 lb, as it loses strength, tends to let more slop out.
>
> If you think about it, a 7 lb with a boiling point somewhere above
> 230 degrees is into temperatures where the engine would be in real
> trouble anyway. Increasing the cap pressure to 13 takes boiling to
> 250, but does that really matter?
>
> I'm thinking I will go looking for a new cap tomorrow as an easy
> "maybe fix", and I will look for one around the same 13 lbs.
>
> On 10/23/2008 at 6:17 PM Leroy Eckert wrote:
>
>> I have a 13lb cap also and it is old. Same year.
>> Leroy Eckert
>> 1990 WB-40 Smoke N Mirrors
>> Dahlonega, GA
>> Royale Conversion
>>
>> --- On Thu, 10/23/08, Joyce and Richard Hayden
>> wrote:
>> From: Joyce and Richard Hayden
>> Subject: Re: [WanderlodgeForum] Losing coolant
>> To: WanderlodgeForum@yahoogroups.com
>> Date: Thursday, October 23, 2008, 8:32 PM
>>
>> Don, I would wonder why someone has put a 13 # cap on your cooling
>> system. The standard for these engines have been 7#. I haven't
>> heard
>> of very many with anything above that.
>>
>> Dick Hayden - '87 PT 38 - Lake Stevens, WA - still in Medford, OR
>> but on
>> the road again tomorrow after the tranny is fixed.
>
>
>
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