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Old 04-28-2005, 02:27 PM
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kpickett kpickett is offline
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LT-1 Thermostat question - JimN?

Two quick questions -

I changed out the thermostats on my '94 LT-1 this morning. It was running a little warm - not hot, but it seemed a little warmer than it should be. I got the new thermostats from my MC dealer, so I know I got the drilled 160.

Here are the questions - when I pulled the old thermostats out, they were both 160 degrees. The dealer gave me a 140 and a 160, and I'm pretty sure I've read that the lower should be 140. Is that the case? Is that also why it would have been running warm?

Also, there's no gasket on the upper thermostat housing, and I now get a very slight water leak out of it. I tightened it up pretty tight, and I don't want to strip the bolts out. Should there be a gasket up there?

Thanks so much for the help. I've learned an awful lot from this board.

Kyle
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Old 04-28-2005, 02:49 PM
PornStar190
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Not really related to your thread, but RPM what does your LT1 Idle at when it's in neutral?

Thanks

PS190
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Old 04-28-2005, 04:28 PM
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NatesGr8 NatesGr8 is offline
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the upper should have a rubber ring that wraps around the lip of the t stat, and the lower is lower temp thermostat.

What temp was your engine running at? I"m having the same problem right now of it running too hot. I'm around 178. I have changed both tstats, impeller, and backflushed just in case of any clogs, and still hot. My next plan of action is to check the circ pump and take apart the risers and manifolds to check for any good clogs.
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Old 04-28-2005, 05:00 PM
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JimN, he is slacking today! But no matter when he shows up he will provide the solution.
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Old 04-28-2005, 05:22 PM
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kpickett kpickett is offline
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Quote:
Originally Posted by NatesGr8
the upper should have a rubber ring that wraps around the lip of the t stat, and the lower is lower temp thermostat.

What temp was your engine running at? I"m having the same problem right now of it running too hot. I'm around 178. I have changed both tstats, impeller, and backflushed just in case of any clogs, and still hot. My next plan of action is to check the circ pump and take apart the risers and manifolds to check for any good clogs.
Yeah, the upper does have the rubber ring. Strange that they had two 160 degree thermostats in there. I just took the boat out, and it runs cooler now. It was running around 170 or so. Now it's about 150 or so. It's hard to tell exactly on that analog guage.

I've been told that running hot can be a problem with the computer. I'm going to take mine in next week to have them check/update/recal the computer. You might check whether you're updated before you start tearing things apart.

My idle is aroun 650 or so.
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Old 04-28-2005, 05:29 PM
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update/recall????? i've heard no such thing.
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Old 04-28-2005, 05:55 PM
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Sorry - that's recalibrate, not recall.
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Old 04-28-2005, 06:23 PM
PornStar190
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650 in neutral, I'm closer to 950 is there anyway to adjust the idle or is that controled by the ECM?
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Old 04-28-2005, 07:45 PM
Tom Jones Tom Jones is offline
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I was going to change the thermostats on my 94 LT1 this year because it was running cool (120). After talking to the local MC dealer they convinced me not to change them as the guages are not that reliable. They told me that unless I had black smoke scum on the back of the hull from unburned gas that it was probably running just fine. Mine idles at 650 also.
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Old 04-29-2005, 02:23 AM
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kpickett kpickett is offline
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Quote:
Originally Posted by Tom Jones
I was going to change the thermostats on my 94 LT1 this year because it was running cool (120). After talking to the local MC dealer they convinced me not to change them as the guages are not that reliable. They told me that unless I had black smoke scum on the back of the hull from unburned gas that it was probably running just fine. Mine idles at 650 also.
I always get a little black smoke scum on the back of my hull. Do you not get any at all? It wipes off easily when I wipe down the boat, but now you've got me worrying.

I figured that for $25, it was worth changing them out.
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