Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 17-06-2014, 13:25   #1
Registered User
 
Richard Z's Avatar

Join Date: Nov 2010
Location: Houseless but in a home
Posts: 251
Perkins 4.108 low-line

Is anybody familiar with the low-line model of the 4.108?
I've been having some problems with mine, mostly overhearing and hat exchanger problems. In my search for a similar heat exchanger, I found out that there are two types, the standard and the low-line. I have the latter, where the heat exchanger is separate from the header tank unlike the standard where it is inside the header tank. Also another difference is the obvious location of the thermostat on the standard, but a mysterious location on the low-line,( I am yet to find it)
If anybody with a little knowledge about the location of the thermostat cab throw in some ideas, that will be greatly appreciated. Also if anybody knows what does the low line mean for that model.
Thanks
__________________

__________________
Nobody knows
Richard Z is offline   Reply With Quote
Old 17-06-2014, 14:17   #2
Guy
Registered User

Join Date: Feb 2013
Location: So. Oregon, USA
Boat: Seafarer36c
Posts: 4,308
Re: Perkins 4.108 low-line

If we are on the same channel, the thermostat is under the header tank.
__________________

__________________
Guy is offline   Reply With Quote
Old 17-06-2014, 16:27   #3
Registered User

Join Date: Oct 2013
Location: Hawaii
Boat: 1978 Cal 39 MKII Tall Mast
Posts: 67
Re: Perkins 4.108 low-line

My Perkins 4-108 was overheating and it turned out to be the heat exchanger. I also replaced the thermostat just in case. Easy and cheap, and yeah: under the coolant tank. The coolant hoses had some scaling which reduced the throughput a bit, so replaced those. The heat exchanger had the worst clogged holes though and a quick muriatic acid soak cured that up. See http://adamrbecker.com/engine-overha...-water-system/ for details.

Sent from my XT1030 using Cruisers Sailing Forum mobile app
__________________
beebopbogo is offline   Reply With Quote
Old 17-06-2014, 17:58   #4
Senior Cruiser
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 7,930
Re: Perkins 4.108 low-line

beebopbogo, I read your blog and like it but have a couple of nits. First, you don't mention cleaning and inspecting the water injection elbow. This item can be a big problem in engine overheating situations. Also about not lubing the new impeller. IMO, that is a big mistake. Some dish liquid and water on the impeller will keep it from overheating in those first seconds before the cooling water reaches it. Also, the hose and anti siphon valve between the heat exchanger and injection elbow should be checked and cleaned.
__________________
The Blue Dot Campaign. This Changes Everything.
DeepFrz is offline   Reply With Quote
Old 17-06-2014, 22:03   #5
Registered User
 
Richard Z's Avatar

Join Date: Nov 2010
Location: Houseless but in a home
Posts: 251
Re: Perkins 4.108 low-line

Thanks.
I have already cleaned all the water tubing abd pipes including the injection elbow and the water heater hoses.
The copy of the shop manual says that these model(low line), the thermostat is located under the water outlet casting and it's on the cylinder head. There is a lot to take off to reach that area, and my concern is that I don't want to take anything off that is not broken. I hate to take stuff off and maybe break a few parts only to find out that the thermostat is good. The old saying about disks( if it ain't broke, don't fix it).
I ordered a new heat exchanger, so I well install it as soon as I receive it abd test for over heating.if none, then problem solved, if not I'll start tearing stuff up to find the thermostat.

Any body has an idea what does the designation low-line stand fur?

Thanks
__________________
Nobody knows
Richard Z is offline   Reply With Quote
Old 17-06-2014, 22:34   #6
Registered User
 
Richard Z's Avatar

Join Date: Nov 2010
Location: Houseless but in a home
Posts: 251
Re: Perkins 4.108 low-line

Correction.the old saying about diesels nit disks
__________________
Nobody knows
Richard Z is offline   Reply With Quote
Old 17-06-2014, 23:57   #7
Registered User

Join Date: Oct 2013
Location: Hawaii
Boat: 1978 Cal 39 MKII Tall Mast
Posts: 67
Re: Perkins 4.108 low-line

DeepFrz: Thanks for the additional content. I'm always learning and that site is definitely a work in progress. It just gets more detailed and more accurate with time thanks to good quality criticism

Richard Z: My Perkins has just a couple easy disconnects and a few bolts to remove the coolant tank. I was worried I'd be digging myself into a new project by removing it, but I was pleasantly surprised at how easy it was.

Sent from my XT1030 using Cruisers Sailing Forum mobile app
__________________
beebopbogo is offline   Reply With Quote
Old 19-06-2014, 08:00   #8
Registered User
 
Richard Z's Avatar

Join Date: Nov 2010
Location: Houseless but in a home
Posts: 251
Re: Perkins 4.108 low-line

Beebopbogo,
Thanks, I was worried, but I did it, and there it was under the header tank. I appreciate it. That manual threw me off and I did not want to think about all the parts that I would have had to remove to get to where it said the thermostat will be. Thanks again....
I could not find a similar thermostat (open at 155 and fully open at 188) so I bought one that starts opening at 160, so hopefully that well be a good choice.
Still waiting for the new exchanger to put in and try it.
__________________
Nobody knows
Richard Z is offline   Reply With Quote
Old 19-06-2014, 08:02   #9
Registered User
 
Richard Z's Avatar

Join Date: Nov 2010
Location: Houseless but in a home
Posts: 251
Re: Perkins 4.108 low-line

Guy,
Thanks also. Y you were right. That's again
__________________
Nobody knows
Richard Z is offline   Reply With Quote
Old 22-06-2014, 11:54   #10
Registered User

Join Date: Nov 2011
Location: California
Boat: Spencer 42 hull 17
Posts: 275
Images: 1
Send a message via Skype™ to Chasing Summer
Re: Perkins 4.108 low-line

DeepFrz ... you know you could sail south to warmer waters, say, the South Pacific. You'd have to change your name, of course.

You mentioned checking the water injection elbow. I've read a lot of your posts. You have a lot of diesel knowledge. I have a quesiton for you. As you know I rebuilt my 4-107. This does not, however, make me a diesel mechanic or installer. The engine I bought for some accessory parts that I didn't have came with a Westerbeke exhaust riser. Which do you prefer and why? injection elbow and water box or exhaust riser and would use a water box with the riser?
I was planning to using 2-45degree elbows to lower the exhaust riser about 4 inches below the manifold before going to the overboard exhaust, which is pointed down just above the waterline. Would it be good to put a high loop with a vent between the riser and the overboard?
I can post a picture of where the engine is in the boat if you need me to.
Attached Images
 
__________________
Lowell - s/v Chasing Summer - Spencer 42/hull 17 ... happy sailing
Chasing Summer is offline   Reply With Quote
Old 22-06-2014, 13:11   #11
Registered User

Join Date: Nov 2011
Location: California
Boat: Spencer 42 hull 17
Posts: 275
Images: 1
Send a message via Skype™ to Chasing Summer
Re: Perkins 4.108 low-line

I've been reading about marine exhaust systems. Hmmm ... guess my aluminum wet riser is way old fashioned and a big NO NO ... especially way I was going to install it.
Just one of the articles I've been reading: Designing a Marine Exhaust System
I'm don't even have the engine bolted down yet, but I'm always planning projected projects. I know that water and engines only mix when done right. Also, 1000 miles out to sea is not the time to discover you should have done it differently.
__________________

__________________
Lowell - s/v Chasing Summer - Spencer 42/hull 17 ... happy sailing
Chasing Summer is offline   Reply With Quote
Reply

Tags
perkins

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Perkins 4/108 high speed/low speed lifeofreilly57 Engines and Propulsion Systems 18 09-09-2013 18:22
Low Oil Pressure at Low Revs Streetcar Engines and Propulsion Systems 6 16-03-2012 11:07
How Often Do You Check Your Water and How Low Is Too Low ? rebel heart Electrical: Batteries, Generators & Solar 51 19-11-2010 08:50
Perkins 4-108 vs Westerbeke 4-108 world spectator Engines and Propulsion Systems 14 15-08-2010 18:33
Perkins 4.108 Fuel Line Interchangeability forsailbyowner Engines and Propulsion Systems 2 24-06-2010 18:54



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 12:49.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.