Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-11-2018, 04:18 PM   #1
Senior Member
 
ak-guy's Avatar
 
City: Gustavus
Vessel Name: Troll Hunter
Vessel Model: Allweather
Join Date: Oct 2016
Posts: 163
3 Cyl Yanmar Valve lash

I want to check valve adjustment on my 3 cylinder Yanmar. I have no record of it ever being done. The manual says to remove the starter to see the timing marks. I would rather not remove the starter and I have read about alternate methods. Here for one: https://www.hoyetractor.com/valve-set.htm

Any advice?
ak-guy is offline   Reply With Quote
Old 09-12-2018, 05:11 AM   #2
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 22,553
That system will work , although more common is a timing method from the eng mfg that sez something like "measure cylinder 3 when the exhaust valve on number 1 is just lifting "
FF is offline   Reply With Quote
Old 09-12-2018, 11:59 AM   #3
Guru
 
City: Anacortes
Join Date: Nov 2012
Posts: 1,189
3 Cyl Yanmar Valve lash

You can pay attention to the firing order on your particular engine and save some time, or on pretty much any engine you can watch the valves go through a cycle and ensure that the valve is fully closed on the base circle and not in the process of lifting or falling and go ahead and adjust. Often takes less time turning the engine over a few times than finding or documenting the procedure from somewhere else. You really just need the lash settings for exhaust/intake.
ghost is offline   Reply With Quote
Old 09-12-2018, 01:57 PM   #4
Guru
 
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,609
Using the timing marks will give you exact TDC which is nice but you can find just about exact TDC with a bright led flashlight and watching closely as you bar the engine. You should be able to set clearance well within tolerances.

NOTE: make sure fuel solenoid is off as you turn engine
SoWhat is offline   Reply With Quote
Old 09-12-2018, 02:22 PM   #5
Technical Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
Turn engine til an intake valve opens, then closes. Then turn another about 120deg. That will be close to TDC. Then set lash on both valves for that cylinder. Repeat for other cylinders.
Ski in NC is offline   Reply With Quote
Old 09-12-2018, 03:23 PM   #6
Valued Technical Contributor
 
DavidM's Avatar
 
City: Litchfield, Ct
Join Date: Aug 2012
Posts: 6,785
Let me add to Ski's sage advice: turn the engine in it's normal direction of rotation.


David
DavidM is online now   Reply With Quote
Old 09-12-2018, 05:56 PM   #7
Senior Member
 
Cat Daddy's Avatar
 
City: Boyd, Texas
Vessel Name: Cat Daddy
Vessel Model: PDQ mv/34
Join Date: Jan 2014
Posts: 113
My method is : EO-IC, when exhaust valve starts to open set the intake. When intake valve is almost closed, set the exhaust. You can do the cylinders in any order. I think it will work on any 4 stroke engine.

Rafe
Cat Daddy is offline   Reply With Quote
Old 09-12-2018, 07:47 PM   #8
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
Can’t it be done dynamically while the engine is running?
All you need then is two clearence numbers.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 09-13-2018, 05:56 AM   #9
FF
Guru
 
FF's Avatar
 
Join Date: Oct 2007
Posts: 22,553
It is fine to check if a lash is too tight by running , but adjustment would be impossible .
FF is offline   Reply With Quote
Old 09-13-2018, 10:22 AM   #10
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
Impossible??
How so??
There would be specs for hot and cold adjustment. Using a feeler gauge while the engine is running is/was (w solid lifters) the most common method as I recall.
How could it be impossible?
Have you done it?

Thinking back one does need the right “feel” of the resistance of the feeler gauge. As you pull the feeler strip out it can’t be w/o any resistance at all. That’s too loose. And if it’s too tight the engine won’t run right.
And sometimes the rocker arm, nut and adjustment screw will be dificult to work with. But it’s fairly easy to tell when you’ve got it right w the feeler.
I don’t think I’ve ever done it cold.

Also to Ak-guy the method you linked looks bullet proof to me .. providing you have the propper cold clearance number.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 09-13-2018, 01:54 PM   #11
Guru
 
City: Full Time Cruising East Coast
Vessel Name: Meridian
Vessel Model: Krogen-42
Join Date: Aug 2011
Posts: 1,014
3 Cyl Yanmar Valve lash

Setting it hot means a warmed up engine, not a running one.
__________________
-------------------------
Terry
Meridian
KK-42097
meridian is offline   Reply With Quote
Old 09-13-2018, 02:47 PM   #12
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
So sorry I left out that detail.
My posts have been too lengthly for many in the past so I’m frequently looking to shortening them. Got caught this time.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 09-13-2018, 02:54 PM   #13
Guru
 
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,609
Quote:
Originally Posted by FF View Post
It is fine to check if a lash is too tight by running , but adjustment would be impossible .
Adjusted all my old V-8's running. Rockers were rocking but so was wrench.
There wasn't that much movement to make it impossible.
I believe Yanmar gives specs for cold adjustment so just make sure you are using correct clearance if engine is hot and/or running.
SoWhat is offline   Reply With Quote
Old 09-13-2018, 03:17 PM   #14
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 18,743
SoWhat,
Most V-8’s had hydraulic lifters. I think.
But I sure did a few 6’s and straight 8’s.

Idea ...
One could adjust an engine cold and then measure the clearence hot while running. Then down the road the results could be used as a benchmark. Checking hot takes very little time so seeing when the next adjustment should be done would be easy. May cost a valve cover gasket .. depending on engine design.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 09-15-2018, 01:23 AM   #15
Senior Member
 
Island Cessna's Avatar
 
Join Date: Feb 2011
Posts: 305
Click image for larger version

Name:	IMG_5644.jpg
Views:	80
Size:	75.2 KB
ID:	80910
Back when solid lifters were the norm they made special wrench/screwdriver combos to adjust valves on a running engine. Loosen lock nut with wrench, screwdriver adjusts the gap to where the feeler gauge just moves, then tighten nut and move to next valve. Still see the old wrenches on Ebay
Island Cessna is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Trawler Port Captains
Port Captains are TF volunteers who can serve as local guides or assist with local arrangements and information. Search below to locate Port Captains near your destination. To learn more about this program read here: TF Port Captain Program





All times are GMT -5. The time now is 01:43 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012