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-   -   LT-1 owners: There is a fix for cooling system issues (http://www.mastercraft.com/teamtalk/showthread.php?t=31626)

gibbons 07-31-2009 04:52 PM

LT-1 owners: There is a fix for cooling system issues
 
Hi All, I am new to this forum, but have lots of MC hours on our 94 205 with an LT-1. It started life with all kinds of cooling system issues, I am surprised I didn't melt it down before I got a handle on things. Way back when, I discovered a fatal flaw in how the engine was applied. I alerted Indmar and MasterCraft, they sent out a service bulletin incorporating the fix I came up with.

With my fix, the engine temp stays absolutely constant within a few degrees, from idle to full throttle. If there is residual interest in this motor or the fix, let me know, and I will take time top post pictures and a scan of the MasterCraft service bulletin (to prove that my info is good). I also have a trick for the heater source and return that I can't take credit for, but perfects the heater. I can share that one, too.

Reply to my post if interested!

D3skier 07-31-2009 05:08 PM

to start off you might want to become a full member of team talk before you go "claiming" you came up with "the fix"

SkiDog 07-31-2009 05:18 PM

Quote:

Originally Posted by D3skier (Post 619885)
to start off you might want to become a full member of team talk before you go "claiming" you came up with "the fix"

I don't recall having seen ANY threads concerning this motor and overheating problems. But I was wrong once before too, so I dunno>!:D

flipper 07-31-2009 05:32 PM

Was the trick to change the impeller?

brat 07-31-2009 06:08 PM

I would certainly like to see the service bulletin, post it up.

Ben 07-31-2009 06:13 PM

+1 for wanting to see it. I've got the same boat. Please become a member and give the description / pictures.

I've had no real issues, but I'd like to add a heater someday, and the temp always seems shaky the 1st few outings of the year, maybe the thermostats just need to get used to working again...

flya750 07-31-2009 06:18 PM

I have a 1997 LT1 .... 730 hours ... no over heating problems?

The heater doesn't stay warm unless the boat is running @ speed. Do you have a fix for that?

gibbons 07-31-2009 07:53 PM

First off, I just posted my first post today, to see if I had any options for fixing a seam in my observer seat. I started reading some unrelated posts and thought maybe I could be a positive contributor. I don't even know how to sign up to be a full team member. Is ignorant instant sarcasm and skepticism how some of this group treats someone offering a great tip? Gee, maybe I don't want to sign up...

Anyone who doesn't know that LT-1's doesn't know what they don't know. The LT-1 has aluminum heads, reverse cooling, and a cam driven water pump (you knew that, right?). That caused a big problem. It was addressed in the June 1996 Service Bulletin that was generated after my disclosure to MasterCraft and Indmar. Does anyone remember MasterCraft's Nathan Long? I sent him the fix initially. He got Indmar's Alan Tehan in touch with me. Is he still around? He flew in from Indiana and rode around in my boat. He also did some altitude tweaking on my EFI calibrations. Still thinking I'm making something up? I am, after all, just a dumb mechanical engineer.

The overheating problem has to do with aerated intake water and steam in the heads. Wanna know more? Tell me how to fully sign up. If your boat doesn't do it, it may have been built after the bulletin, and had the modification done at the factory.

Yes, I have a fix that will make the heater work full temperature at idle. Absolutely, positively. You will love it. It's a simple plumbing routing. We used to ski mostly in the off season, which meant the water was usually 50 degrees and below. I have wakeboarded while it was snowing, one day we waterskied in the morning and snow skied that afternoon. My family was on the evening news weather for being crazy. Anyway, when it's that cold, you want a heater working full time. Yes, I can show that trick too. But again, I didn't come up with that one. Another LT-1 owner discovered the right plumbing to do it. I showed him how to keep from cooking his motor (the service bulletin topic).

So, if you want more, help me out to get fully registered or whatever. But please knock off with the doubt.

SkiDog 07-31-2009 08:55 PM

Quote:

Originally Posted by gibbons (Post 619952)
First off, I just posted my first post today, to see if I had any options for fixing a seam in my observer seat. I started reading some unrelated posts and thought maybe I could be a positive contributor. I don't even know how to sign up to be a full team member. Is ignorant instant sarcasm and skepticism how some of this group treats someone offering a great tip? Gee, maybe I don't want to sign up...

Anyone who doesn't know that LT-1's doesn't know what they don't know. The LT-1 has aluminum heads, reverse cooling, and a cam driven water pump (you knew that, right?). That caused a big problem. It was addressed in the June 1996 Service Bulletin that was generated after my disclosure to MasterCraft and Indmar. Does anyone remember MasterCraft's Nathan Long? I sent him the fix initially. He got Indmar's Alan Tehan in touch with me. Is he still around? He flew in from Indiana and rode around in my boat. He also did some altitude tweaking on my EFI calibrations. Still thinking I'm making something up? I am, after all, just a dumb mechanical engineer.

The overheating problem has to do with aerated intake water and steam in the heads. Wanna know more? Tell me how to fully sign up. If your boat doesn't do it, it may have been built after the bulletin, and had the modification done at the factory.

Yes, I have a fix that will make the heater work full temperature at idle. Absolutely, positively. You will love it. It's a simple plumbing routing. We used to ski mostly in the off season, which meant the water was usually 50 degrees and below. I have wakeboarded while it was snowing, one day we waterskied in the morning and snow skied that afternoon. My family was on the evening news weather for being crazy. Anyway, when it's that cold, you want a heater working full time. Yes, I can show that trick too. But again, I didn't come up with that one. Another LT-1 owner discovered the right plumbing to do it. I showed him how to keep from cooking his motor (the service bulletin topic).

So, if you want more, help me out to get fully registered or whatever. But please knock off with the doubt.


First of all, we all on here like to have a little fun with EVERYBODY that shows up here. I didn't see ANYBODY doubt what you said, they just said they'd like to see MORE. personally, I don't have an LT-1, so no, I wouldn't know that it has aluminum heads, reverse cooling , and a cam driven water pump. So I've got NO dog in that fight.
Secondly, IF you are a mechanical engineer, you should be able to figure out a simple process for signing up on here. Its NOT hard.
We welcome EVERYBODY, (with the exception of a select few)( and you're NOT in that select few, BTW) to this board! I suggest that you thicken up your skin just a wee bit, join, and have fun like the rest of us do on here. We always like to hear from people that know what they are talking about, even IF we do rag you a little bit.
BTW, what year is your boat? Skidog

JimN 07-31-2009 08:59 PM

Quote:

Originally Posted by gibbons (Post 619952)
First off, I just posted my first post today, to see if I had any options for fixing a seam in my observer seat. I started reading some unrelated posts and thought maybe I could be a positive contributor. I don't even know how to sign up to be a full team member. Is ignorant instant sarcasm and skepticism how some of this group treats someone offering a great tip? Gee, maybe I don't want to sign up...

Anyone who doesn't know that LT-1's doesn't know what they don't know. The LT-1 has aluminum heads, reverse cooling, and a cam driven water pump (you knew that, right?). That caused a big problem. It was addressed in the June 1996 Service Bulletin that was generated after my disclosure to MasterCraft and Indmar. Does anyone remember MasterCraft's Nathan Long? I sent him the fix initially. He got Indmar's Alan Tehan in touch with me. Is he still around? He flew in from Indiana and rode around in my boat. He also did some altitude tweaking on my EFI calibrations. Still thinking I'm making something up? I am, after all, just a dumb mechanical engineer.

The overheating problem has to do with aerated intake water and steam in the heads. Wanna know more? Tell me how to fully sign up. If your boat doesn't do it, it may have been built after the bulletin, and had the modification done at the factory.

Yes, I have a fix that will make the heater work full temperature at idle. Absolutely, positively. You will love it. It's a simple plumbing routing. We used to ski mostly in the off season, which meant the water was usually 50 degrees and below. I have wakeboarded while it was snowing, one day we waterskied in the morning and snow skied that afternoon. My family was on the evening news weather for being crazy. Anyway, when it's that cold, you want a heater working full time. Yes, I can show that trick too. But again, I didn't come up with that one. Another LT-1 owner discovered the right plumbing to do it. I showed him how to keep from cooking his motor (the service bulletin topic).

So, if you want more, help me out to get fully registered or whatever. But please knock off with the doubt.

I was an MC tech starting in late '97 and we had all of the bulletins AFAIK, which I read. I also went to MC training in March of '98. Care to PM me so I know which bulletin it was?

I remember Nathan and it was Alan who developed the training courses, among other things. If it was the bleeder lines or the holes in the thermostat, they were in place before I started working on these.

Welcome to Team MasterCraft but,

You have basically walked into a room full of people who were in the middle of several conversations, without bothering to introduce yourself before saying that you're not sure you like being here. This is your second post, right? No offense, but it was kind of an awkward entry. I don't think anyone will have a problem with knowing about your fix for the LT-1 but to come in, claim that you fixed it without providing anything to support it doesn't really make it so, even if it's absolutely true. I don't know why you would expect total strangers to believe what anyone says just because they say it's true. I doubt you would do this, especially considering your field. You work in a field that would never accept someone's word for any kind of claim without proof, right?

It would be better to get to know the people here before you tell them to not doubt your qualifications and FYI, you're not the only engineer here. We have all kinds of people, from all walks of life and while we may toss odd comments around, the vast majority are good natured. Sure, we have some who don't get along but if we all sat here singing Kumbaya, it would be a really boring place, IMO.

BTW- it's not that hard to look around for the buttons for registration. Here's a link- it's in hte middle of the top gray bar:
http://www.mastercraft.com/teamtalk/portal.php


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