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  #1  
Old 08-30-2013, 08:55 PM
Bashby Bashby is online now
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CH25 rocker bolt stripped

My Scag TT's CH25 started missing, I shut it off, wouldnt start back up. Pulled the VC's and one exhaust rocker arm is laying there sideways. Pulled the threads out of the head. It looks like a simple heli-coil and re-install. Anything else I should check? I have a bunch of mowing to do before I leave for FA on tuesday and don't want any more unexpected surprizes.
It looks like a 1/4" fine thread. (1/4-28?) It wouldn't be metric would it?
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  #2  
Old 08-30-2013, 09:22 PM
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CLARK LAWN CLARK LAWN is offline
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Probably is metric. There us a reason that happened, meaning something else likely Failed and caused that to happen.
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Old 08-30-2013, 09:31 PM
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piston slapper piston slapper is offline
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Everything on that engine is metric. The. Bolt is an M6 x 1.0 thread..
Check your lifters....pump them down...also check for bent pushrods..
Make sure your engine oil is clean.....thick dirty oil can plug up the lifters..
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Old 08-30-2013, 09:54 PM
Bashby Bashby is online now
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Thanks, I think I have a m6x1.00 helicoil set... Its 10 miles west and the place that has a decent selection is 15 miles east. It was missing a little earlier today. One time I brought it down to half throttle and 15 seconds later it almost stalled. I put it back to full throttle and it blew some black smoke for a couple seconds, then revved up and ran ok but had a little miss to it.
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  #5  
Old 08-31-2013, 06:33 AM
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piston slapper piston slapper is offline
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Replace the lifters...
Change the oil and filter..
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  #6  
Old 08-31-2013, 06:56 AM
Bashby Bashby is online now
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Quote:
Originally Posted by piston slapper View Post
Replace the lifters...
Change the oil and filter..
It is a little overdue for an oil change. I have to add oil every 5-6 hours and I use Mobil 1, so I wasn't worried about changing it at 50 hrs... it has about 60 on it. (1750 or so hrs on machine) Are you thinking a lifter pumped up enough to coil bind the spring and strip the threads? I doubt I can get a lifter today, is that something a Kohler dealer would normally stock? How about taking the lifter apart and cleaning it and inspecting?
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  #7  
Old 08-31-2013, 07:27 AM
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piston slapper piston slapper is offline
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If you can find MELLING lifters for a chevy sb 350...they will work..
Make sure to get Melling...as others may cause issues in kohler engines..

Lifters wear out like every other engine part...
Simply replacing the lifters on a high hour engine will usually give you a noticable increase in performance..
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Old 08-31-2013, 08:14 AM
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piston slapper piston slapper is offline
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Don't forget to torque the rocker studs to 100 inch pounds....
Wouldn't want to strip any more threads....
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  #9  
Old 08-31-2013, 08:16 AM
Bashby Bashby is online now
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Autozone shows 2 different Melling lifters for an 87 350. Any idea what the difference is? (other than price)



Melling/Valve Lifter







(0 reviews)
Click to View Details
Part Number: JB-2079
Alternate Part Number: HL-2111
Warranty: 1 YR

Notes: Stock replacement lifter. Priced individually.

Price: $9.99
STORE PICK UP
In Stock
SHIP TO HOME
In Stock
ADD TO CART
Melling/Valve Lifter







(0 reviews)
Click to View Details
Part Number: JB-817
Alternate Part Number: HL-1817
Warranty: 1 YR

Notes: Priced individually.

Price: $3.49
STORE PICK UP
In Stock
SHIP TO HOM
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  #10  
Old 08-31-2013, 08:37 AM
Bashby Bashby is online now
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Nevermind, it looks like one is a roller lifter.
Compare
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Highlight Options: Highlight Different Values Melling JB-2079 - Melling Factory Hydraulic Roller Lifters Melling JB-817 - Melling Replacement Hydraulic Lifters
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Brand Melling Melling
Manufacturer's Part Number JB-2079 JB-817
Part Type Lifters Lifters
Product Line Melling Factory Hydraulic Roller Lifters Melling Replacement Hydraulic Lifters
Summit Racing Equipment Part Number MEL-JB-2079 MEL-JB-817
Price

$14.97


$4.97
+ to Cart
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