Reply
 
Thread Tools Search this Thread Display Modes
 
Old 11-11-2016, 06:29 PM   #21
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
Ok.so some mannuals say retorque, some say no. The "experts" say...well it depends...and have heard AD say as long as 2500 hr before worrying about anything.

So what does the average guy do when the history of the engine is unknown....and what references would help clear that up?

So even if you replace everything....500 hrs? 1000 hrs? 2500 hrs?.... or wait till something happens?
psneeld is offline   Reply With Quote
Old 11-11-2016, 07:51 PM   #22
Senior Member
 
bgillroy's Avatar
 
City: Marathon, FL & On Loop
Vessel Name: Maka Honu
Vessel Model: Ta Yang, 42 Tayana PH Trawler 1976
Join Date: Mar 2014
Posts: 313
I have become one with my engines embracing their needs have applied custom appliance to rotate and regap so I know valve is correct and applied test instruments to have them speak to me and I go from there , yes I love them those old engines are quite special ..not just power but also friends I look after...
bgillroy is offline   Reply With Quote
Old 11-12-2016, 09:33 AM   #23
Guru
 
alormaria's Avatar
 
City: Trenton
Join Date: Apr 2012
Posts: 1,521
Quote:
Originally Posted by bgillroy View Post
I have become one with my engines embracing their needs have applied custom appliance to rotate and regap so I know valve is correct and applied test instruments to have them speak to me and I go from there , yes I love them those old engines are quite special ..not just power but also friends I look after...

I'm not sure what you're saying here, but I like the way you said it.
__________________
Al Johnson
34' Marine Trader
"Angelina"
alormaria is offline   Reply With Quote
Old 01-19-2017, 09:58 AM   #24
Newbie
 
City: La Paz,MX
Join Date: Jan 2017
Posts: 2
Just for my own info, where did the .015" clearance and set COLD come from? My manual only gives .015 inlet and .018 exhaust set at "normal Operating temperature" I sure like the Cold set idea, much more comfortable in a cool engine room.
somf is offline   Reply With Quote
Old 01-19-2017, 10:03 AM   #25
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
Some of the professional engine guys have said for Lehmsns, the difference betweenn hot and cold...no big deal.

The 120 and the 135 are different so make sure you are getting the right clearances.

My 120 was set to 135 clearances by mistake the first 2 years I owners her, American Diesel said no big deal, but the other way around may have been more trouble.....so close tolerances are nice to meet...but real life experiences show that slop here and there is less than critical.
psneeld is offline   Reply With Quote
Old 01-19-2017, 10:10 AM   #26
Newbie
 
City: La Paz,MX
Join Date: Jan 2017
Posts: 2
I guess I answered my own question, I dug out the Ford service manual and it states .015 for both valves on a NA engines hot or cold. Interesting to know how Lehman came up with .015 and .018 in the Owners Manual?
somf is offline   Reply With Quote
Old 01-19-2017, 10:40 AM   #27
Guru
 
kchace's Avatar
 
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,259
Quote:
Originally Posted by somf View Post
I guess I answered my own question, I dug out the Ford service manual and it states .015 for both valves on a NA engines hot or cold. Interesting to know how Lehman came up with .015 and .018 in the Owners Manual?

I have several Ford Lehman manuals and various data in them is all over the place. Like you, the manual I just looked in says .015 for Intake and Exhaust for NA engines. Yet in this same manual, it says to check the valves at the first 50 hours and then it never indicates that they need to be checked again! Another manual I have (my hardcopy) says to check them every 600 hrs. I believe the info that they can be done cold has come from American Diesel. (At least that's what they told me). I think their exact words were "That will get you close enough". One way to prove if its necessary to do hot is to do it hot just as the Owner's manual states, then check them again when the engine is stone cold. If they're still within reason, then it could be done cold.

Ken
kchace is offline   Reply With Quote
Old 01-19-2017, 11:37 AM   #28
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
Call American Diesel or Bomac...

The specs for the 135 are different from the 120

I was told by American Diesel (and yes they have been known to give different info to different people)...

120 Lehman
Cold Exhaust .010-.014 Intake .014-.018
Hot Exhaust .012 Intake .015

Probably why they told me a 120 set at the 135 .015 is better than a 135 set at 120 specs because you might burn the exhaust valve. Not being a full time mechanic I cant say that's true... but others confirmed the thought.

I have at least 4 manuals for Lehmans and they are all a little different. I find it frustrating not knowing which one to believe.
psneeld is offline   Reply With Quote
Old 01-19-2017, 12:45 PM   #29
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
Pretty rare for intake to have more clearance than exhaust, are you sure about that?
Ski in NC is offline   Reply With Quote
Old 01-19-2017, 01:13 PM   #30
Guru
 
psneeld's Avatar
 
City: Ft Pierce
Vessel Name: Sold
Vessel Model: Was an Albin/PSN 40
Join Date: Oct 2011
Posts: 28,119
Quote:
Originally Posted by Ski in NC View Post
Pretty rare for intake to have more clearance than exhaust, are you sure about that?
What Am Diesel gave me and what is in my Saber Lehman manual...just quadruple checked.
psneeld is offline   Reply With Quote
Old 01-19-2017, 03:44 PM   #31
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
Got it. Just did not want bad info to stand. Some engines do have the clearances that way, just rare.
Ski in NC is offline   Reply With Quote
Old 01-19-2017, 07:34 PM   #32
Guru
 
City: Boston
Vessel Name: Adelante
Vessel Model: IG 30
Join Date: Nov 2016
Posts: 1,608
My 1986 SABRE manual for the 120hp Dorset:
Intake .015 Exhaust .012

My 1987 LEHMAN manual for the 135hp Dover:
Intake .015 Exhaust .015

All adjustments at operating temp.
(Note: Turbo is .018)

These are both 6cyl 380 cu in engines but the Dover's had closer tolerances and larger ports thus higher hp. I believe Lehman distributed both but put chrome valve covers on the Dover.

I don't believe .003 would make a huge difference in a 40 or 50 year old engine unless you were doing a complete valve job.

-Gary
SoWhat is offline   Reply With Quote
Old 04-25-2017, 03:16 PM   #33
Guru
 
City: Full Time Cruising East Coast
Vessel Name: Meridian
Vessel Model: Krogen-42
Join Date: Aug 2011
Posts: 1,014
Set my valves on my 90's to .015. They were at .020-.022. This was probably the first time in 4,000 hrs.
__________________
-------------------------
Terry
Meridian
KK-42097
meridian is offline   Reply With Quote
Old 04-25-2017, 03:35 PM   #34
Moderator Emeritus
 
Comodave's Avatar
 
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,129
I took Bob Smith's last seminar in October 2015. We set the valves cold and then started up the engine. Bob said it sounded great. He said that he could tell if they were out of adjustment by the sound. He was extremely knowledgeable about the engines.
Comodave is offline   Reply With Quote
Old 11-16-2019, 11:30 PM   #35
Member
 
Island fish lifter's Avatar
 
City: Port alberni
Join Date: Oct 2019
Posts: 20
Being a diesel mechanic for many years, I’ve never retorqued head bolts, nor have I recommended it.
As far as adjusting valves, there are many ways. As long as you are on the inner base circle you are good.
Island fish lifter is offline   Reply With Quote
Old 11-17-2019, 06:40 PM   #36
Senior Member
 
jimdavi's Avatar
 
City: San Francisco
Vessel Name: Couple’s Retreat
Vessel Model: 2019 North Pacific 45
Join Date: Aug 2014
Posts: 460
What’s inner base circle?
jimdavi is offline   Reply With Quote
Old 04-29-2020, 06:08 PM   #37
KDA
Veteran Member
 
City: Vancouver
Join Date: Jan 2017
Posts: 46
Thank you for all your replies to my post. However, we seem to have missed the target. My question is - when I removed the rocker cover and I was looking at the valves, I couldn't determine which valve in each cylinder was the intake and which one was the exhaust. I need to know because they require different gaps. Is the valve closest to the front of the engine the intake and does the relationship remain the same for all the rest of the cylinders?
KDA is offline   Reply With Quote
Old 04-29-2020, 07:12 PM   #38
Guru
 
kchace's Avatar
 
City: Brookline, NH
Vessel Name: Shalloway
Vessel Model: Defever 44, twin Perkins
Join Date: Sep 2013
Posts: 2,259
Quote:
Originally Posted by KDA View Post
Thank you for all your replies to my post. However, we seem to have missed the target. My question is - when I removed the rocker cover and I was looking at the valves, I couldn't determine which valve in each cylinder was the intake and which one was the exhaust. I need to know because they require different gaps. Is the valve closest to the front of the engine the intake and does the relationship remain the same for all the rest of the cylinders?
I don’t see another post of yours in this thread so I don’t know what engine you’re referring to since several engines are spoken about in this thread. If you’re talking about a Ford Dover engine (90 and 135 hp) then all valves are to be set at .015” hot or cold according to my manual. In any case for Dorset or Dover engines the valves do NOT repeat the same sequence from front to back.

Ken
kchace is offline   Reply With Quote
Old 04-29-2020, 07:18 PM   #39
KDA
Veteran Member
 
City: Vancouver
Join Date: Jan 2017
Posts: 46
Ken, I have a Lehman 120 - I believe it is a Dorset model but don't quote me on that. I have the manual and I believe it has to be hot before you can adjust the valves. The gap is different for intake than for exhaust. My problem is that I don't know how to identify the intake valves from the exhaust valves.
KDA is offline   Reply With Quote
Old 04-30-2020, 05:13 AM   #40
Senior Member
 
Redhook98's Avatar
 
City: Colonial Beach, VA
Vessel Name: Tatoosh
Vessel Model: 1979 49ft Marine Trader RPH
Join Date: Jun 2019
Posts: 365
My advice is to download an engine manual. Its states pretty clearly which are which and how to to do the gap adjustments. That way it is all right in front of you. Just did this myself.
__________________
"Everything on your boat is broken.... You just don't know it yet."
Redhook98 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Replacing a Ford Lehman SP135 Larry M Power Systems 45 12-27-2016 03:59 PM
Lehman engine parts BobH Power Systems 41 06-21-2012 10:45 PM
Lehman Engine Rebuild DVD patzfan4eva Taiwanese Makes 8 02-20-2012 04:09 AM
Adjusting Morse dual SR controls cody707 Power Systems 3 05-02-2011 09:05 AM
Fuel tank valves Forkliftt Other Trawler Systems 5 11-11-2007 02:09 PM

» 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 11:11 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