UK Stationary Engine Forum
 

Go Back   UK Stationary Engine Forum > Main Engine Section > Engine-Only Stuff > Diesel Engine Section

Reply
 
Thread Tools Display Modes
Old 06-09-17, 06:00 PM   #1
chrismac
Forum Supporter 2011
 
chrismac's Avatar
 
Join Date: May 2010
Location: Wick, Highlands
Posts: 1,107
Default Valve Lapping, New seats cut, Question

All, I am currently lapping in the valves on a mitsubishi 3 cylinder engine, I have given the seats a clean up with a valve seat cutter, my question is regarding the valves after lapping, I poured some diesel into the inlet ports should I be aiming for no leakage after lapping or is a small weep after an hour or so acceptable,

Thanks Chris

Last edited by chrismac; 06-09-17 at 10:04 PM.
chrismac is offline   Reply With Quote
Old 06-09-17, 06:29 PM   #2
Windrush
Forum Supporter 2011
 
Windrush's Avatar
 
Join Date: Apr 2008
Location: Matlock, Derbyshire.
Posts: 6,949
Default

A "small weep" over that period of time will be fine Chris. We only left petrol etc in for about a minute to test seat/valve sealing.

Pete.
Windrush is offline   Reply With Quote
Old 06-09-17, 07:13 PM   #3
Chippie
Senior Member
 
Join Date: Mar 2011
Location: Heritage Green Backworth, Newcastle
Posts: 508
Default

A uniform matt grey ring is what you are looking for......I usually pour petrol in, hold the valve by hand and count to ten....never had a fail yet....
Chippie is offline   Reply With Quote
Old 06-09-17, 07:24 PM   #4
chrismac
Forum Supporter 2011
 
chrismac's Avatar
 
Join Date: May 2010
Location: Wick, Highlands
Posts: 1,107
Default

Thanks both for the replies, at least I know I am aiming in the right direction, all is good then.

Chris

Last edited by chrismac; 06-09-17 at 10:03 PM.
chrismac 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 12:41 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.