Register free!

The Green Industry's Resource Center



Reply
 
Thread Tools   Display Modes
  #1  
Old 09-30-2009, 10:02 AM
hoylebros's Avatar
hoylebros hoylebros is offline
LawnSite Member
 
Join Date: Feb 2008
Location: Midland, NC
Posts: 100
Engine knocking..

I have a Toro 60'' with a 27HP Kohler engine. The thing runs great and starts every time but, probably 9 times out of 10 when I shut the engine off it will knock really bad and/or backfire. Has anyone had this problem before or maybe knows what the problem is...Engine has 500hrs on it. Thanks guys!
Reply With Quote
  #2  
Old 09-30-2009, 04:15 PM
Two Seasons's Avatar
Two Seasons Two Seasons is offline
LawnSite Senior Member
 
Join Date: Jun 2007
Location: Waukesha, WI
Posts: 791
We have the same engine on our Turf Tiger.

We let it idle for about 30 seconds before shutting it down. No problems with doing it this way.
__________________
We like orange machines!
Reply With Quote
  #3  
Old 09-30-2009, 06:27 PM
jvanvliet's Avatar
jvanvliet jvanvliet is offline
LawnSite Gold Member
 
Join Date: Aug 2009
Location: South Florida
Posts: 3,935
Have X-Mark Lazer Z with 27hp Kohler. Had same problem with engine knock after shutting down. Since I run it for 4 to 6 hours straight in the Florida heat, I throttle down real slow and let idle for about 2 minutes or so while my men blow off the mower and I swill large quantities of Gatorade. Works great. You'll get a sense of timing with experimentation for your machine. Some guys idle for a few seconds, others for a few minutes. Do what works for you!
Reply With Quote
  #4  
Old 09-30-2009, 07:32 PM
Restrorob's Avatar
Restrorob Restrorob is offline
LawnSite Fanatic
 
Join Date: Apr 2005
Location: Show'n my truck off !
Posts: 10,775
Some will chime in and say the manual states to shut down at 3/4 or higher throttle setting. Well, As said it's what ever works for you. I don't start a engine at 3/4 or do I shut one off at 3/4, A few second cool down works fine. Again..... It's what works for you.
__________________
Quote:
Originally Posted by piston slapper View Post
You never learn anything until you admit you don't know it all...
Quote:
Originally Posted by MannsLawnService View Post
some times the man in my mirror isn't so smart...
"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
  #5  
Old 10-01-2009, 06:55 AM
jvanvliet's Avatar
jvanvliet jvanvliet is offline
LawnSite Gold Member
 
Join Date: Aug 2009
Location: South Florida
Posts: 3,935
Shutting down at anything significantly more than idle produces engine knock in my machine. I use medium grade gasoline so I don't think it's the low octane rhumba. Whatever causes it, I cure it by idling down slowly and letting the engine run at low idle for a couple of minutes. There's lot's of things in books and manuals that contradict practical experience in the field. Knocking is the spark plug firing on an empty chamber... right? I don't think that's good for the engine. Since the guy who wrote the manual is not out in the field... as Frank Sinatra said "I do it my way".
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 02:41 PM.

Page generated in 0.07126 seconds with 9 queries