Thermostat or Vernatherm??

[rickdb1boat]

Hello all<br /><br />Wanting to replace the T-stat(Vernatherm) in my 1991 70 HP Rude. On Ishopmarine they show the Vernatherm and then the whole thermostat assembly. Do I just order a new Vernatherm or do I order the T-stat assembly(Which, BTW, looks nothing like I have in there now)? Appreciate it guys. Here's a link to my choices:<br /><br /> ishopmarine.com

 

[ob]

Re: Thermostat or Vernatherm??

I'd get the entire T/stat assy to include the cup and seat(14 &15).These parts are often worn or distorted from age and deposits.Also check to see if there are any bullitens on your particular engines cooling sysytem that would change which T/stat assy. spring is used and may also change the tell tale orifice and just use the hose that leads from block through a rubber grommet inserted in engine pan.Last OMC(waterpump/ T/stat) kit I bought from dealer showed the changes that applied to my 96' model.<br /><br />Just below is what is written in the Bombardier waterpump kit instructions I last bought.This kit changed the impeller from a three flute(original) to a six flute.Not sure which your engine is equipped with,but this newer kit says it applies to your year model engine.Here goes.<br /><br />Remove T/stat cover and spring.<br />If the spring is straight and has an inside diameter 15/16" discard the original and replace with the staright spring supplied in kit.T/stat cover does not have to be changed.<br /><br />If you have a different style T/stat spring discard the original spring and T/stat cover and replace with the conical shaped spring supplied and new supplied T/stat cover.<br /><br />Remove grommet and or restricter from lower motor cover.<br /><br />Install new grommet supplied and overboard indicator hose into lower motor cover.

 

[OBJ]

Re: Thermostat or Vernatherm??

That parts breakdown is a 90' or earlier Rick. 90' was the last year OMC did the that particular t-stat assembly....the one that screws apart so you could replace the vernatherm. My part smart shows a full t-stat assembly PN434137, for 91'. Why not check the BRP site and compare it with ishopmarines.

 

[rickdb1boat]

Re: Thermostat or Vernatherm??

Thanks Guys. I will check it out and see what the dealer and BRP site comes up with. OB, I did change the Waterpump impeller recently and used the 6 flute style, which is what I was running already. The dealer did not mention any other changes when I bought it. OBJ, I must have pulled up a 90' instead of the 91' on ishop. I went back into ishop and did see it is the 434137 that is the correct one for mine. I should have just picked up a stat when I did the pump. Thanks for the help and I'll be heading to the dealer this morning to pick one up. I really don't know if it's bad, but I want to be safe rather than sorry. It got me thinking after I fired it up after putting the pump in, the water from the telltale never did warm up at all. Seemed kinda odd to me, as I remember it getting a little warm before. Not that I check it that often and I know it is water pumped out BEFORE the stat. Thanks again and I'll check on those other things that you mentioned OB, when I get to the dealer....

 

[BoatBuoy]

Re: Thermostat or Vernatherm??

You said your engine was a '91, but the ishopmarine site you referenced is for a '90.

 

[rickdb1boat]

Re: Thermostat or Vernatherm??

Yep, I realized that this morning...