[C38] Coolant Return Hose

[tdtron at earthlink.net]

Hello Jay,

The thermostat bypass hose is to allow a limited amount of circulation from the water pump so that all the water will heat uniformly.  If you didn't have that hose, the engine could overheat before the thermostat opened.  Since only a very small amount of circulation is needed to get the warmed water to the thermostat the hose can be very small.  Even on large V-8 car engines the bypass hose is rarely more than about 1/2" inside diameter.

Tom Troncalli


----- Original Message ----- 
From: Jay Sorensen 
To: tdtron at earthlink.net;Catalina 38 Listserve
Sent: 10/25/2011 2:29:26 PM 
Subject: RE: [C38] Coolant Return Hose


Hi Tom,
 
It is the thermostat bypass hose.  I thought with the small ID that it would be too small when compared to auto engines, but with your suggestion I’ll give it a try.  
 
Thanks!................Jay  
 



From: listserve-bounces at catalina38.org [mailto:listserve-bounces at catalina38.org] On Behalf Of tdtron at earthlink.net
Sent: Tuesday, October 25, 2011 11:26 AM
To: Catalina 38 Listserve
Subject: Re: [C38] Coolant Return Hose
 
Hello Jay,
 
Is the hose you refer to a coolant return hose or a thermostat bypass hose.  If it is a thermostat bypass hose, any automotive parts store should be able to offer a bypass hose close enough to work if you show them the old hose to match.
 
Tom Troncalli
 
 
----- Original Message ----- 
From: Jay Sorensen 
To: listserve at catalina38.org
Sent: 10/25/2011 12:57:20 PM 
Subject: [C38] Coolant Return Hose
 
Good Morning Fellow 38’rs!
 
Well it looks like what I thought was a post overheating head gasket leak turned out to be an almost imperceptible leak coming from a very old coolant return hose coming off the thermostat housing.  Whodathunkit!  Huge sigh of relief here.
 
In looking for a replacement I’m having trouble finding a molded replacement hose P/N 298841 for our M-30.  I’ve checked around and nobody seems to stock it.  Is there a high temp flexible ½” id hose out there that others have had good luck with?  Or a source for the molded part?  I’m concerned with it kinking over that very short run.
 
Any suggestions out there??  Thanks much! 
 
Jay & Dorothy Sorensen
C-38 #311 Broad Reach 
San Diego, CA
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