Register free!
Search
 
     

The Green Industry's Resource Center


Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 08-17-2013, 12:49 AM
redeye1964 redeye1964 is offline
LawnSite Member
 
Join Date: Mar 2011
Location: New South Wales,Australia
Posts: 9
no threads in Kohler SV470 engine mount holes

I'm fitting a SV470 into a ride-on, went to screw the bolts into the engine mounting holes - they are unthreaded......is this normal with these engines, do I have to tap threads into them? Seems crazy to me, wondering if it is a casting error?? Please help, I need to get this going, I'm a contractor




as you can see, 3 holes are blind, no way to use nut/bolts, except for 1
Reply With Quote
  #2  
Old 08-17-2013, 05:17 AM
Restrorob's Avatar
Restrorob Restrorob is offline
LawnSite Fanatic
 
Join Date: Apr 2005
Location: Show'n my truck off !
Posts: 10,246
Most equipment makers use self tapping screws when installing engines so no threads is normal, Cut your own with a tap or use the factory equipment bolts...... But....Be careful, I snapped a self tapper off in a brand new aluminum spindle housing ONCE......
__________________
Quote:
Originally Posted by piston slapper View Post
You never learn anything until you admit you don't know it all...

"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
Reply With Quote
  #3  
Old 08-17-2013, 08:57 AM
BigFish's Avatar
BigFish BigFish is offline
LawnSite Bronze Member
 
Join Date: Jul 2008
Location: chesapeake, va
Posts: 1,511
As was mentioned, you'd be better off to cut new threads using a tap. You can prolly get by with just a " plug tap" which will cut almost to the bottom of the blind holes. If ya don't have a plug tap, you can grind some of the lead/ point off a regular taper tap.
Use plenty of lube and blow out the chips, shouldn't have any problems.
__________________
" But let me tell you something ,folks: You can't fix stupid! There's not a pill you can take, there's not a class you can go to. Stupid is forever!"

......AMF!

Last edited by BigFish; 08-17-2013 at 09:04 AM.
Reply With Quote
  #4  
Old 08-17-2013, 09:13 AM
dutch1's Avatar
dutch1 dutch1 is offline
LawnSite Silver Member
 
Join Date: Dec 2004
Location: Jayhawk
Posts: 2,132
This is just another process the manufacturers eliminate to reduce the cost of production. I've never attempted to use self tappers on a new block--I always tap threads since breaking one off while removing an engine. Grade 5 and 242(blue) Loctite works for me.
Reply With Quote
  #5  
Old 08-17-2013, 06:42 PM
redeye1964 redeye1964 is offline
LawnSite Member
 
Join Date: Mar 2011
Location: New South Wales,Australia
Posts: 9
thanks for the advice, I'll tap threads rather than risk self threaders
Reply With Quote
  #6  
Old 08-19-2013, 02:26 AM
redeye1964 redeye1964 is offline
LawnSite Member
 
Join Date: Mar 2011
Location: New South Wales,Australia
Posts: 9
finally fitted, was a big job - best part of 3 days, where I usually do an engine swap in a matter of hours - all due to the mounting arrangement......mower is a Cox, made in Oz
Reply With Quote
  #7  
Old 08-21-2013, 04:28 PM
gnobles gnobles is offline
LawnSite Member
 
Join Date: Jun 2013
Posts: 4
I had good success today tapping threads with this technique:
Attached Images
       
Reply With Quote
  #8  
Old 08-21-2013, 04:55 PM
Valk's Avatar
Valk Valk is offline
LawnSite Silver Member
 
Join Date: Dec 2007
Location: Eastern KS
Posts: 2,709
Is the above method preferable to a self tapping screw/bolt? Mechanics??
__________________
---------------------------------------------------
~ cut it high ~ let it fly ~
---------------------------------------------------
Some folks are so contrary that if they fell into a river,
they'd insist on floating upstream.
~ Josh Billings
Reply With Quote
  #9  
Old 08-21-2013, 05:32 PM
gnobles gnobles is offline
LawnSite Member
 
Join Date: Jun 2013
Posts: 4
I should have also mentioned that I inserted the thread cutting tool only 3 to 5 threads deep, then pulled it out, blew it off with air, blew the hole out with air, and then repeated until finished. I also lubricated the hole with WD-40.

I had never done this before, but found it to be a surprising easy process.
Reply With Quote
  #10  
Old 08-21-2013, 05:56 PM
Restrorob's Avatar
Restrorob Restrorob is offline
LawnSite Fanatic
 
Join Date: Apr 2005
Location: Show'n my truck off !
Posts: 10,246
Quote:
Originally Posted by Valk View Post
Is the above method preferable to a self tapping screw/bolt? Mechanics??

As I mentioned above, After snapping one off...... ALL un-threaded holes get tapped......
__________________
Quote:
Originally Posted by piston slapper View Post
You never learn anything until you admit you don't know it all...

"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump





Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 06:21 AM.

Page generated in 0.07690 seconds with 10 queries