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Tap Size For A Kohler K241 Headbolt Hole


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#1 Mike125s OFFLINE  

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Posted January 04, 2014 - 01:19 PM

Hi group

 

I had the #9 headbolt stripped at the top third or so of the threads.  I tried to research on the tap size for a kohler k241 head bolt but have been unsuccessful.  I think it is an M10x1.5 bolt(does that seem correct?)

The guys a Napa and Ace hardware claimed a 10mmx1.5 tap would fit the hole, but to me it seems too large.  Before I force that size tap down ,I thought maybe see what you guys think? Thanks much

 

Mike

Genoa,IL



#2 OkieGt OFFLINE  

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Posted January 04, 2014 - 01:25 PM

This from Brian Millers site, hope it helps.

 

 

Cylinder Head Bolts and Flat Washers for Cylinder Heads Above - Note: The length of any bolt do not include the head itself. All bolts are measured from under the head to the end of the threads.

For Kohler engine models K141 (6¼hp), K160 (6.6hp), K161 (7hp) and K181/M8 (8hp). 5/16" diameter x 1-1/2" long. Kohler part #'s 41 086 02-S (bolt), 220534-S (washer).

  • Aftermarket. High quality grade 8 bolts and washers. $10.50 per set of 7 each, plus shipping & handling.
  • OEM Kohler parts. $49.35 per set of 7 each, plus shipping & handling.

For Kohler engine models K241/M10 (10hp), K301/M12 (12hp) and K321/M14 (14hp). 3/8" diameter. NOTE: Bolt length is determined by type of cylinder head used. Head with short bolt holes requires 1-1/2" long bolts, and head with tall bolt holes requires 2-1/2" long bolts.

  • 1-1/2" long. Aftermarket. High quality grade 8 bolts and washers. Kohler part # 270158 (bolt; discontinued from Kohler), 270889-S (washer). $13.50 per set of 9 each, plus shipping & handling.
  • 2-1/2" long. Aftermarket. High quality grade 8 bolts and washers. Kohler part # 235175-S (bolt), 270889-S (washer). $13.50 per set of 9 each, plus shipping & handling.
  • 2-1/2" long. OEM Kohler parts. $88.00 per set of 9 each, plus shipping & handling.

Edited by OkieGt, January 04, 2014 - 01:26 PM.

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#3 Mike125s OFFLINE  

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Posted January 04, 2014 - 01:31 PM

I guess what I am asking is what size tap for an m10x 1.5  bolt?? Is it a 10mmx1.5 tap or something else(smaller diameter tap).. Thanks much.  I have limited experience using tap and die data..

 

Mike

Genoa,IL



#4 chris m ONLINE  

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Posted January 04, 2014 - 01:50 PM

I guess what I am asking is what size tap for an m10x 1.5  bolt?? Is it a 10mmx1.5 tap or something else(smaller diameter tap).. Thanks much.  I have limited experience using tap and die data..

 

Mike

Genoa,IL

Mike, the head bolt thread is 3/8-16 these engines don't use any Metric threads. Maybe the parts guy was figuring you could tap it with a 10mm to see if you could save yourself form having to install a thread cert?

 

If it is just the starter threads then I would try chasing the threads with a 3/8-16 tap first.


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#5 Mike125s OFFLINE  

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Posted January 04, 2014 - 02:02 PM

Thanks Chris.  I think a 3/8x16 thread chaser would be best.

 

Mike

Genoa,il



#6 superaben OFFLINE  

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Posted January 04, 2014 - 02:10 PM

M10 standard pitch and 3/8-16 is easy to confuse.  The nuts nearly cross between themselves. 

 

Ben W.


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#7 LTD OFFLINE  

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Posted January 04, 2014 - 05:06 PM

  I think a 3/8x16 thread chaser would be best.

 

If it is stripped, you may have trouble getting threads again. I had one strip out, but there was about 1/2 inch of thread at the bottom that wasn't being used. Just used a longer bolt.


Edited by LTD, January 04, 2014 - 05:06 PM.

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#8 OkieGt OFFLINE  

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Posted January 04, 2014 - 05:51 PM

Mike, the head bolt thread is 3/8-16 these engines don't use any Metric threads. Maybe the parts guy was figuring you could tap it with a 10mm to see if you could save yourself form having to install a thread cert?

 

If it is just the starter threads then I would try chasing the threads with a 3/8-16 tap first.

Thanks, thats what I was try to show and say with Brian Millers info, that the bolt was SAE, not Metric, you actually said it, lol


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#9 JDBrian OFFLINE  

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Posted January 04, 2014 - 09:42 PM

10mm is just a smidge larger than 3/8 at about .394. Perhaps the person who recommended this thought that the extra size would allow the threads to hold. It's actually a slightly finer thread as well at about 17TPI. I'd first try to use a longer bolt if possible. If you get a dead end tap you might be able to clean the threads up all the way to the bottom of the hole which with a longer bolt might do the job. 


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#10 Mike125s OFFLINE  

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Posted January 05, 2014 - 10:10 AM

Thanks guys,  I ended up making a thread chaser out of  a 3/8x16 bolt and grinding flutes into it with a dremel. I got the threads cleaned up somewhat .  The headbolt now threads into the remaining threads.  I have not decided to use a stud or the old bolt yet.  I surfaced the head on wet/dry 220 sandpaper this am for 1/2 hour.  Thanks for all the help

 

Mike

 

Genoa,IL


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#11 OkieGt OFFLINE  

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Posted January 05, 2014 - 10:13 AM

10mm is just a smidge larger than 3/8 at about .394. Perhaps the person who recommended this thought that the extra size would allow the threads to hold. It's actually a slightly finer thread as well at about 17TPI. I'd first try to use a longer bolt if possible. If you get a dead end tap you might be able to clean the threads up all the way to the bottom of the hole which with a longer bolt might do the job. 

I think the 10mm would have made it way worse real quick


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