UK Stationary Engine Forum
 

Go Back   UK Stationary Engine Forum > Main Engine Section > Engine-Specific Forum Sections

Reply
 
Thread Tools Display Modes
Old 07-12-17, 09:14 PM   #1
1956ld1
Senior Member
 
1956ld1's Avatar
 
Join Date: Jun 2015
Location: galway ireland
Posts: 221
Default Tolerances

Hi all,
Since my Jap 6 is starting to become my favorite engine, I have come to the decision to try reduce some of the knock by putting new conrod shell in it. L & S engineers seem to have the part at a good price but they are +010 over size? I don't want to go through have the crank reground for these but my theory is that maybe its "reground itself" over the years? If anyone has the correct diameter for the crank, it would be much appreciated if you where to share the info with me.
Kind regards,
Josh.
1956ld1 is offline   Reply With Quote
Old 07-12-17, 09:16 PM   #2
listerdiesel
Admin Team
Forum Supporter
 
listerdiesel's Avatar
 
Join Date: Feb 2008
Posts: 15,833
Default

That would be undersize, not oversize?

Peter
listerdiesel is offline   Reply With Quote
Old 07-12-17, 09:24 PM   #3
1956ld1
Senior Member
 
1956ld1's Avatar
 
Join Date: Jun 2015
Location: galway ireland
Posts: 221
Default

I my self, have never understood the way they size them??- https://www.lsengineers.co.uk/jap-mo...18475-010.html
1956ld1 is offline   Reply With Quote
Old 07-12-17, 09:36 PM   #4
Lister M
Senior Member
 
Join Date: Jun 2009
Location: Bedfordshire
Posts: 3,907
Default

Quote:
Originally Posted by 1956ld1 View Post
Hi all,
Since my Jap 6 is starting to become my favorite engine, I have come to the decision to try reduce some of the knock by putting new conrod shell in it. L & S engineers seem to have the part at a good price but they are +010 over size? I don't want to go through have the crank reground for these but my theory is that maybe its "reground itself" over the years? If anyone has the correct diameter for the crank, it would be much appreciated if you where to share the info with me.
Kind regards,
Josh.
The problem with a crank regrinding its self is highly unlikely and could have worn its self more than the 10 thou shells you can get and the one thing it wont be is round because of the way the engine works, if you don't have an accurate measurement of a new crank you could fit the shell into the conrod and get the bore measured accurately and then compare it with the smallest measurement found on the worn crank to see how much its got to be ground.

Martin P
__________________
Lister optimum melius quam ceteri, quid tibi pro vita.
Lister M is offline   Reply With Quote
Old 07-12-17, 10:13 PM   #5
1956ld1
Senior Member
 
1956ld1's Avatar
 
Join Date: Jun 2015
Location: galway ireland
Posts: 221
Default

After hearing this I think I have went deaf to the knock, I will probably leave it until I have the exact measurements,
Thanks,
Josh.
1956ld1 is offline   Reply With Quote
Reply

Bookmarks

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


All times are GMT +1. The time now is 09:10 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.