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  #21  
Old 02-24-2018, 04:37 PM
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Default Re: may have found issue on my rebuild

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Originally Posted by 300 H and H View Post
As I recall a snowmobile club had pulled a rather huge groomer with it, in New York or some near by State..

There was a You Tube of it pulling the groomer out there some were..
the video. It says it's a 1974, but the factory serial places it in 1978.


https://www.youtube.com/watch?v=jh1iKPhmRlk
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  #22  
Old 03-18-2018, 09:17 PM
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Default Re: may have found issue on my rebuild

Well, took her (sno-vit) out for a second shakedown run with the wife along for the ride. About 5 miles in the oil temp, cylinder head temp and the alt light indicated an issue. Unfortunately we were on a rather steep grade at the time and I had to go forward. after a safe parking and cool down, we were able to turn around, and once started downhill coast (no engine) most of 3 miles. Then the run 3 minutes, cool 30 started. Belt had 10-12 hours on it. tensioned per the book.

On the good side, dealt with some pretty bad ruts, and the tracks stayed right where they were supposed to be.
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  #23  
Old 03-18-2018, 09:33 PM
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Default Re: may have found issue on my rebuild

That's the same look on my face when I have a mechanical issue far from home,and a long way to walk!
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  #24  
Old 03-18-2018, 10:43 PM
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Default Re: may have found issue on my rebuild

first run was ok? holes in the pan are a plus.
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  #25  
Old 03-18-2018, 10:45 PM
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Default Re: may have found issue on my rebuild

Sequence of events: "that doesn't smell right"
+15 seconds Alt light
+30 sec cyl head temp visible moving
+45 sec Oil temp starts moving

took about three minutes to get to a stop spot. Cyl head 375-395.

while waiting for cool down: Hear gas boiling in carb.

I was on a slope that has my 4-runner spinning tires in good weather if I'm not careful. Was performing great until then. Sloppy snow like that at meow #2. Tracks self cleared pretty well.
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  #26  
Old 03-18-2018, 10:54 PM
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Default Re: may have found issue on my rebuild

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first run was ok? holes in the pan are a plus.
Yep first run OK, and the second up to the "that doesn't smell right" point/

missing the fan belt does nasty things...
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  #27  
Old 03-18-2018, 11:01 PM
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Default Re: may have found issue on my rebuild

be sure the airhorn isn't sucking in hot air from the engine bay. a good seal is needed to the hood. car weather stripping works good from the cowling
my new muffler smoked till the paint was burned off.
you had no belt?
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  #28  
Old 03-18-2018, 11:11 PM
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Default Re: may have found issue on my rebuild

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you had no belt?
Had one starting, had one up to the 5 mile point. after that no, it was in pieces.

Up to then it was keeping it's cool real well. Even in the heavy slop and the slope.
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  #29  
Old 03-18-2018, 11:53 PM
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Default Re: may have found issue on my rebuild

Did you have a spare?
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  #30  
Old 03-18-2018, 11:54 PM
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Default may have found issue on my rebuild

Maybe try a serpentine drive from CB Performance? Going to try it on my 58/1600 ST Dual Port.Name:  0A043BC4-0782-478B-AEF7-D6F846AA1DEB.jpg
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  #31  
Old 03-18-2018, 11:58 PM
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Default Re: may have found issue on my rebuild

Also the gas boiled in mine all the time. Sometimes Id have to let it quit bubbling before I started it.
On the belt, I see you have an alternator. You want to make sure you have the correct backing plate that holds it to the fan shroud. There is a difference in offset between the generator ( which yours originally came with) and the alternator backing plates.
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  #32  
Old 03-19-2018, 12:04 AM
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Default Re: may have found issue on my rebuild

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Originally Posted by Sno-Surfer View Post
Also the gas boiled in mine all the time. Sometimes Id have to let it quit bubbling before I started it.
On the belt, I see you have an alternator. You want to make sure you have the correct backing plate that holds it to the fan shroud. There is a difference in offset between the generator ( which yours originally came with) and the alternator backing plates.

This was a package engine I bought to replace the trashed engine it came with., I never thought to check alignment. Both the original engine and the replacement has alternators.
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  #33  
Old 03-19-2018, 12:06 AM
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Default Re: may have found issue on my rebuild

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Did you have a spare?
Spare????? No that would have been too easy. I inspected it before the trip, why would it just fail?????
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  #34  
Old 03-19-2018, 11:24 AM
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Default Re: may have found issue on my rebuild

Exactly what Sno-surfer said, there is a difference between the backing plates between generator vs. alt, make sure its lined up properly. You also need to have 10 shims in upper pulley, whatever shims you don't need in between pulley you put them on the outside. Very important or the nut will bottom out but pulley still loose. If lined up properly and tensioned you will never throw a belt.
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  #35  
Old 03-19-2018, 12:25 PM
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Default Re: may have found issue on my rebuild

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Originally Posted by NorCal View Post
If lined up properly and tensioned you will never throw a belt.
Tension was checked prior to this trip. Looking at the belt remains, it looks like it came apart. found several chunks in the skid pan. what was still on the pulley was the top surface of the belt.
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  #36  
Old 03-19-2018, 01:29 PM
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Default Re: may have found issue on my rebuild

Post a picture of your backing plate and I can tell you if its the correct one.
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  #37  
Old 03-19-2018, 04:17 PM
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Default Re: may have found issue on my rebuild

Quote:
Originally Posted by Sno-Surfer View Post
Also the gas boiled in mine all the time. Sometimes Id have to let it quit bubbling before I started it.
On the belt, I see you have an alternator. You want to make sure you have the correct backing plate that holds it to the fan shroud. There is a difference in offset between the generator ( which yours originally came with) and the alternator backing plates.
I think Sno -Surfer is right.
Make sure you have the correct Backing plate on the alternator,..... and take a look if the belt is on parallel way on the fun and the backing plate. ok

Nikos
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  #38  
Old 03-19-2018, 04:22 PM
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Default Re: may have found issue on my rebuild

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Originally Posted by NorCal View Post
Exactly what Sno-surfer said, there is a difference between the backing plates between generator vs. alt, make sure its lined up properly. You also need to have 10 shims in upper pulley, whatever shims you don't need in between pulley you put them on the outside. Very important or the nut will bottom out but pulley still loose. If lined up properly and tensioned you will never throw a belt.
Maybe these fotos will help.

Nikos
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  #39  
Old 03-19-2018, 09:30 PM
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Default Re: may have found issue on my rebuild

at our leavenworth events i seen 2 shredded belts. both were at high rpms when they failed.
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  #40  
Old 03-19-2018, 10:15 PM
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Default Re: may have found issue on my rebuild

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Originally Posted by JimVT View Post
at our leavenworth events i seen 2 shredded belts. both were at high rpms when they failed.

After much thought, I am leaning to the following scenario:
Cat sits most of 3 years with only the occasional ( like 2)low rpm run. belt is taking a set where it is wrapped for long periods of time motionless and tight. First real run this year was short and slow, mostly to check for binding and track belt tension. Then I really try to run her. Not red-line rpm, but near. Not for 5-10 minutes but for most of hour. belt separates and that's that. The cords in the belt were missing most of the rest of the belt.

Checked tonight: pulley alignment: Center line of the two pulleys off about 2 mm. With vw's method of tensioning, that has to happen as the cl of the alternator pulley shifts with the shim stack. Both the damper and alt pulley are parallel. Alt pulley tight on shaft with no movement.

I will provide pix of mounting as I pull it just to check, I couldn't get good photo tonight

When I had her running before meow#1 I found that on hard pulls, keeping the rpm's way up kept the temp well within reasonable range. That engine speed may have been my undoing. I will see what the racing crowd uses for buggies/baja. Or perhaps I just need to run her more often (that's the idea) and change the belt yearly.

Besides changing the oil, anything else I need to do/check before next run? Can the excess heat affect the valve pushrod gap to where I need to go through them?

One more item for the spares kit. it's light and easy to store and I already had the required tools on board.

Just once I would like everything to just "as easy to drive as a car" rather than the "No Learning Curve Too Steep, No Pockets Too Deep"

CT
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