Am i the only one that has this problem?
Second sled, same problem.
GS6
Second sled, same problem.
GS6
Powervalve hitting piston
- Thread starter summ8rmk
- Start date
Wtf?? thats crazy. Are you power cable to spec length?
The cable does not hold the valve in place, there is a tab on top of the valve that rests on the jug, preventing the valve from entering the cylinder.
Last sled made it 3,800+ miles, this sled has less than 1,500.
Here is the other piston. It has contact from both sides of the valve.
Last sled made it 3,800+ miles, this sled has less than 1,500.
Here is the other piston. It has contact from both sides of the valve.
If the pv was hitting your piston you would have a nice shiny piston in many pieces. Laydown motors will have a few scratches on the exhaust side, just the nature of the beast. Getting a bid of blow by though. How many miles? might be time for a new topend..
Its not a cold seize, its the exhaust valve.
GS6
GS6
Any damage to the rings? its hard to tell from the pics. But they do seem awful close. If it was touching it would catch a ring and boom.
-Pull the power valve and see if there are wear marks on it,,,,if not then likely a cold seize
--Looks like there is material missing from the piston ring as well,,,
--Seems the power valve would make more contact on the piston though. if that what it was
--Looks like there is material missing from the piston ring as well,,,
--Seems the power valve would make more contact on the piston though. if that what it was
C
Its not a cold seize. Its the powervalve hitting the piston. I had the same issue
The stop tab on the powervalve hits the stop in the cylinder and will wear the cylinder. You could pull the powervalve and grind down the edges of the powervalve, but untill the cylinder is fixed it going to get worse. If you remove the powervalve from the cylinder, and look where the powervalve stop makes contact with the cylinder-you will see the issue.
Send the cylinders to Millennium Technologies and they will repair them/hone them. Then install new piston rings.
Do a search on this topic, there are a few older threads about it.
The stop tab on the powervalve hits the stop in the cylinder and will wear the cylinder. You could pull the powervalve and grind down the edges of the powervalve, but untill the cylinder is fixed it going to get worse. If you remove the powervalve from the cylinder, and look where the powervalve stop makes contact with the cylinder-you will see the issue.
Send the cylinders to Millennium Technologies and they will repair them/hone them. Then install new piston rings.
Do a search on this topic, there are a few older threads about it.
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C
The two edges of the powervalve will make contact with the piston before the rest of the powervalve will.
you can also get carbon build up on the valve and it will leave marks on the piston too but not damage the rings.
as said above pull the valve and look at the seat/stop point on the jug for and indent from the valve stop.
as said above pull the valve and look at the seat/stop point on the jug for and indent from the valve stop.
Sent from my SCH-R970 using Tapatalk
I know what is happening, my question is y?
This is the bullet proof cat 800.
Why are my cat 800s having the same problem. Oil related?
I have ran the same oil in all my sleds.
Sent from my SCH-R970 using Tapatalk
This is the bullet proof cat 800.
Why are my cat 800s having the same problem. Oil related?
I have ran the same oil in all my sleds.
Sent from my SCH-R970 using Tapatalk
put the grinder to the valve edges, will not affect it a bit.
Sent from my SCH-R970 using Tapatalk
C
Has nothing to do with what oil you use.
The aluminum cylinder seat is being deformed by the powervalve stop. Your pic shows the problem.
Its not just you 800's having this issue
The aluminum cylinder seat is being deformed by the powervalve stop. Your pic shows the problem.
Its not just you 800's having this issue
I figured my 09 was worn from 4,000 miles, my 14 has less than 1,500.
GS6
GS6
C
Mine had less than 1500 miles on it to. I ground down the edges of the powervalve and ran it 200 more miles and pulled the pipe to inspect the pistons and it was worse. It seems once that aluminum starts to deform it will continue to progress. Thats when I sent the cylinders in and put a new top end in it. Ran if for a season and rechecked it, and it looks like brand new.
