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  #1  
Old 05-10-2013, 11:15 PM
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mgs96ps mgs96ps is offline
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LT1 thermostat/s questions

TT members,

I am trying to do research before I order parts to replace both thermostats on my new to me 96 prostar 190 with LT1.

Questions include:

(1) does the 160 T require a gasket between water pump and T housing?
(2) does the 160 T require an o-ring inside T housing?
(3) does the 140 T require a gasket?

Thanks for your help.
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  #2  
Old 05-10-2013, 11:20 PM
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1) No, see #2
2) Yes, it is an o-ring that is sliced to fit around the edge of the thermostat
3) Yes, triangular paper type.
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  #3  
Old 05-10-2013, 11:40 PM
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Thank you Table Rocker.

O ring only for 160 and paper only for 140. Do you use any gasket maker on either?
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  #4  
Old 05-10-2013, 11:57 PM
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Can't seem to find the o-ring on inboard online. Any suggestions would be great.
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  #5  
Old 05-11-2013, 08:05 AM
blackcreek blackcreek is offline
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Any auto parts store is going to have one, fel-pro gasket 35710
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  #6  
Old 05-11-2013, 08:17 AM
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mgs96ps mgs96ps is offline
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thanks blackcreek,

please comment on post #3
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  #7  
Old 05-11-2013, 08:24 AM
blackcreek blackcreek is offline
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No gasket maker on the o-ring gasket is needed. If the triangular metal housing for the 140 t-stat is corroded clean it up with some sandpaper and use a light film of gasket maker on the gasket.
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  #8  
Old 05-11-2013, 10:14 AM
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I agree with a light film. I usually put the thinnest possible layer of rtv blue. Just put a little on your fingertip and wipe it on.
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  #9  
Old 05-14-2013, 06:14 PM
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mgs96ps mgs96ps is offline
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Boat: 96 ProStar 190 LT1
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I would love for someone to explain and/or correct my understanding of the water flow from lake to exhaust on the LT1! (no heater and no shower)

Here is what I know so far:

-into boat via inlet port in hull
-pass trans cooler
-into raw water pump pass impeller
-up into mixing unit where some slips pass closed 140T to cool manifold but majority goes into main water pump
-main water pump and into block and heads
-at 160 water temp main thermostat opens sending hot water back to mixer
-after mixing if water temp is above 140...thermostat opens and out to manifolds, otherwise back into main water pump

Last edited by mgs96ps; 05-14-2013 at 06:46 PM.
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  #10  
Old 05-14-2013, 06:44 PM
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Another question from a new owner of a 96 Prostar with LT1.

I have seen pictures with hose bibs on top of mixing unit, in front of main water pump.

Is this used to run boat on hose? If so, do people remove impeller to run this way?

Thanks
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