Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 03-05-2015, 06:27   #1
Registered User

Join Date: May 2015
Posts: 1
Perkins 4.108 Blowing exhaust

Just bought an 86 Kaarina Seacat motorsailer. The Perkins 4.108 is blowing a lot of exhaust when cranked, and I can't seem to figure out why. I have included a video for reference.
Attached Files

Alex-Lewis is offline   Reply With Quote
Old 03-05-2015, 06:54   #2
Registered User

Join Date: Jul 2012
Location: somewhere in Mexico
Boat: 99 Island Packet 380
Posts: 203
Re: Perkins 4.108 Blowing exhaust

Looks like the injectors are leaking and spraying diesel.

s/v Nakamal
azsailor12 is offline   Reply With Quote
Old 03-05-2015, 07:00   #3
Registered User
S/V_Surya's Avatar

Join Date: Mar 2009
Location: Sasafra river,MD
Boat: gulfstar ketch 41 Surya
Posts: 651
Re: Perkins 4.108 Blowing exhaust

I agree or head gasket. Try tightening down on injector bolts but be careful the hold downs are easily broken. Low compression is why it will not crank.
S/V_Surya is offline   Reply With Quote
Old 03-05-2015, 07:31   #4
Registered User

Join Date: May 2014
Location: Antwerpen
Boat: Dufour 35 1973
Posts: 88
Re: Perkins 4.108 Blowing exhaust

Were the injectors taken out recently? If so, check that the copper washers under the injectors are inserted correctly.
Vipe6 is offline   Reply With Quote
Old 04-05-2015, 08:04   #5
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2014
Location: Ft Lauderdale
Boat: KP 46
Posts: 189
Images: 2
Re: Perkins 4.108 Blowing exhaust

It is that number 2 injector. you can see and hear it only blowing on that compression stroke. Would suggest you pull it out, check the injector for cracks, check the copper washer (someone may have even left it out), and look for cracks around the hole the injector goes into. Then put never seize around the base, (NOT on the tip) re-install, (if you can spin it a bit to make sure it seats, then put the nut on it and torque it to 12 ft/lbs.

captmikem is offline   Reply With Quote
Old 04-05-2015, 14:04   #6
Registered User

Join Date: Sep 2008
Location: Clyde,scotland.
Boat: seadog 30
Posts: 22
Re: Perkins 4.108 Blowing exhaust

Run a compression test.If low new head gasket with blue hylomar paste both sides. reseat injectors with new washers.
bigman1 is offline   Reply With Quote
Old 04-05-2015, 15:16   #7
Registered User

Join Date: Apr 2015
Posts: 6
Re: Perkins 4.108 Blowing exhaust

When ever I take my injectors out I always hold the copper rings over the gas flame on the stove... heat them real hot then dunk them into cold water this softens them and they will seal no problem after that.. also use same thing after I undo a flared copper pipe connections and never have leaks . That motor sure sounded like it has a problem for sure.
geedee is offline   Reply With Quote
Old 04-05-2015, 17:16   #8
Registered User
northiceman's Avatar

Join Date: Sep 2008
Location: North America
Boat: Custom, Ketch, 50 - N'Ice
Posts: 52
Re: Perkins 4.108 Blowing exhaust

My first impression was an injector(s) leaking. Like the other person said-it may be a leak in the engine head. I would start by tightening (no more than 12 ft-lbs) the injector feed lines and the overflow lines (from top of injector). You may want to loosen then back-check if there is one that is crossthreaded and re-tighten. DO NOT bend those copper injector feed lines going to the injectors-because if you do it will be a bitch to get 'em back on again.
Notice the misting - thats diesel coming out under much pressure - whatever you do- do not get your hands near that - a severe blood infection could be the result. There is enough pressure at an injector to inject diesel right thru the skin and into the bloodstream !
northiceman is offline   Reply With Quote
Old 05-05-2015, 13:17   #9
Registered User

Join Date: Mar 2008
Posts: 22
Re: Perkins 4.108 Blowing exhaust

It is a difficult problem to analyze from the video but you definitely seem to have a fuel leak on the high pressure side. As others have posted, carefully tighten the injector mounting bolts to compress the copper washer. I always install new ones when servicing the injectors. That engine should start fairly easily on three cylinders providing that there is good compression so I suspect there may be more than one problem. When was the last time that the valves were adjusted (should be every 500 hours)? Is the fuel shut-off cable fully seated on the injection pump? If it isn't, the engine will never start. The injectors should be serviced (replaced or rebuilt) every 1500 - 1800 hours.

4-108s and for that matter all older 4 series Perkins are generally indestructible if kept in a reasonably good service condition which is why they have such a solid reputation. As with all diesels, clean fuel and clean air and a good starting source will make for a a happy and reliable engine.

Captain Bob is offline   Reply With Quote

exhaust, 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
For Sale: Perkins 4.107/108 Bowman Exchanger/Exhaust Manifold svJuggernaut Classifieds Archive 2 03-12-2014 10:09
Exhaust Not Emitting Enough Water with Exhaust swahealy2 Engines and Propulsion Systems 24 13-06-2011 10:08
Perkins 4-108 vs Westerbeke 4-108 world spectator Engines and Propulsion Systems 14 15-08-2010 17:33
Perkins 4-107 Won't Stop Blowing Head Gaskets chihuahuas Engines and Propulsion Systems 34 30-10-2009 15:53

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:14.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.