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Perkins 4108

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ratboy
New member
Username: ratboy

Post Number: 1
Registered: 12-2006
Posted on Wednesday, December 13, 2006 - 04:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

new here need help
where is the oil pressure sender on a perkins 4108. thanks
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IAIN MAC
Visitor
Posted on Thursday, April 05, 2007 - 09:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

PLEASE COULD SOME ONE TELL ME WHAT GRADE OF OIL I SHOULD USE FOR MY MARINISED 4108 ENGINE AT THIS TIME OF YEAR - THANKS
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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 229
Registered: 07-2003


Posted on Thursday, April 05, 2007 - 12:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The new recomomdation is 15w40 diesel engine oil. Use this all year round.
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bobsnads
New member
Username: bobsnads

Post Number: 1
Registered: 07-2007
Posted on Saturday, July 21, 2007 - 05:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I there a trick to removing injectors from a Perkins 4-108? Any help is apprciated.
Bob
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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 255
Registered: 07-2003


Posted on Sunday, July 22, 2007 - 10:15 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

If you have the standard cav injector with 2 nuts to remove just pry up on the ears. If you have the pencile injectors with one nut holding it in,you can have problems. Carbon can leak around the seal at the bottem and lock it in. I was told to use a ladyslipper tool to remove them if tight. However in one case i had to remove the head and drive out from the bottem. You need a special punch that only pushes on the outside of the injector tip to do this or you will make things worse.
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mike mullen
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Posted on Tuesday, May 05, 2009 - 02:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I NEED A USED, OR REBUILT DUAL OIL COOLER FOR A PERKINS 6-354T RANGE 4. CAN ANYBODY HELP ME. THANKS, MIKE
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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 356
Registered: 07-2003


Posted on Tuesday, May 05, 2009 - 07:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I 'am guessing you want a water to oil cooler. The older engines used a cylinder type heat exchanger. The surplus center used to have them, now they have mostly air oil coolers. A lot of the newer engines had coolers in the radiator and they have much larger oil lines going to them. You could try valu-bilt.
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manatee_84
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Username: manatee_84

Post Number: 1
Registered: 03-2009
Posted on Sunday, March 21, 2010 - 12:25 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I need some help/advise regarding a 1984 vintage 4-108 new to me last spring. This past winter I updated the fuel filtration system with two racor filters (the small ones with spin-on cartriges and settling bowls below). I also removed a number of ball valves and copper tubing since it was an overly complicated system that has a genset and diesel fireplace added over the years. The GenSet and fire place work, but I am having problems with the Perkins.

One of the things I replaced was the leaky hose assembly from the copper fuel lines to the engine and the return hose assembly from the engine to the copper. Since these assemblies are no longer available, I created my own with Coast Guard approved hose and 1/4 inch steel tube with copper farrels. I took the threaded fittings off the old assembly. If I could get thread to barbed hose fittings, I would just route hose directly to the primer pump.

When I attempt to purge the air from the system, the primer pump makes squirting sounds and I am not sure if this is normal or if I am sucking air or there might be a pin-hole in the diaphram.

So here are a couple of questions:

Should there be some sort of rubber gasket/washer on the end of the 1/4 in fuel line where it attaches to the primer pump?

How do you get to the fittings on the injector pump? It is covered by the heat exchanger.

Has anyone found thread/barbed fittings to connet the fuel hose directly to the engine?

One of the fittings I removed during the upgrade looked like a small check valve. Is this a piece that is required to be in the system just ahead of the primer?

Is it advisable to install an electric lift pump? This is what I had on a previous boat with a Westerbeke.

Any advise would be appreciated. I doubt there is a Perkins Marine mechanic within three or four hours drive time, so I am pretty much on my own.

Thanks
Steve
Kennewick, Washington
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larry_from_maryland
Senior Member
Username: larry_from_maryland

Post Number: 390
Registered: 07-2003


Posted on Sunday, March 21, 2010 - 12:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Without seeing the fitting you have its hard to tell. Vintage stuff often used wipp fittings to attach the fuel line. They used a rubber washer inside to help absorb the vibration.Not all used this type. If the diaphram has a hole the engine will fill with fuel. If most of the system is dry you should hear it pumping, but from what your saying probably have a leak somewhere. If you changed the filters you need to bleed the injector pump.The primer pump should have built in check valves, sometimes you see extra ones added.An electric pump works great you can turn on the pump and fill everything without cranking the engine. You need a pump that makes around 10 psi. Parts places try to sell what they have in stock and now they stock high psi pumps for car injector systems.Some perkins systems have a restrictor/ check valve hooked above the filters which is supposed to bleed off small amounts of fuel /air and send to the return line.If i could see the stuff i might be more help.
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matt_morehouse
Advanced Member
Username: matt_morehouse

Post Number: 38
Registered: 12-2009
Posted on Sunday, March 21, 2010 - 02:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I had a Freya 39 with a Volvo MD17C. I replaced all the copper fuel lines with Aeroquip fuel line, added a Racor filter and a 12v automotive fuel pump. The electric fuel pump completely eliminated bleeding hassles.

I also removed the mechanical lift pump and covered the opening with a plate. I don't recall how I mated the Aeroquip stuff to the engine but since I can't recall I guess it wasn't a problem. After this refit I never had another fuel problem

That engine and fuel system used banjo fittings. If you (or anyone else) needs banjos let me know I have a mess of them.
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manatee_84
New member
Username: manatee_84

Post Number: 2
Registered: 03-2009
Posted on Sunday, March 21, 2010 - 11:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Larry and Matt,

Thanks for the replies. I spent a few hours today trying to bleed the air from the system. No success yet. I appreciate the offer on the banjo fittings - the perkins has quite a number of them and all appear to be in fine shape.

In trying to resolve my issue, I went back to the parts book for the Perkins. There are a significant number of washer/bushings noted as "olive". My Westerbeke and farm tractor experience has not encountered this part name. Can anyone fill me in on exactly what an olive is?

I think air is entering the fuel line at the lift pump. Until I resolve that issue, I doubt that the engine will start.

I will drop down to the boat this week and take a couple of photos so you can give me more clear advise.
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Rich marine
Visitor
Posted on Tuesday, September 28, 2010 - 04:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Have a look here, olives

http://en.wikipedia.org/wiki/Compression_fitting
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AC Grimwade
Visitor
Posted on Monday, October 17, 2011 - 04:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I over heated my Perkins 4.108 yesterday. Long story short when I was idling it to cool. I was infact making it worse as the coolant had leaked out. There were no scary sounds, she just petered out. Now she won't start. She turns over, she has fuel (I bled the lines just in case), she has coolant and the coolant leak fixed, but doesn't seem to manage enough compression to start up.

The oil looks ok (not milky), and the coolant level is maintaining. What should I do next? If I had blown the head gasket wouldn't there be some kind of sign?
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oslin04
Senior Member
Username: oslin04

Post Number: 62
Registered: 10-2006
Posted on Tuesday, October 18, 2011 - 05:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi AC Grimwade,
Re the over heating of your perkins, it is possible you have a degraded head gasket and or over heated the rings but, I would first of all remove the injectors and put about half a egg cup of engine oil down each bore, roll the engine over a couple of times and replace the injectors and try for a start, it may just be dry bores again due to the over heating if you are lucky,
be lucky
Regards Keith Inglis. Marine Engineer
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terryf
New member
Username: terryf

Post Number: 1
Registered: 11-2011
Posted on Saturday, November 05, 2011 - 06:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi can anbody please help me I have a cruiser with a Perkins 4108 in. I took the injectors out to clean wish I didnt, when i refitted them one of the couplings that hold them in place broke then i actually noticed that two others had slight cracks in them. does any one know where I could get replacements. Please help
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big_e
New member
Username: big_e

Post Number: 1
Registered: 02-2012
Posted on Monday, February 20, 2012 - 01:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hello: Have a buddy stuck down in Cabo with a Perkins 4108 problem. He had to re4place the injector pump. I've pasted his remarks below and am looking for advice to help him.
"Perkins 4-108, it runs but every once in a while it makes a loud clang
noise. If I loosen the input to each of the four injectors one at a
time it stumbles a little which tells they are all firing. It can go
for a while but then it clangs again. I don't think anything is broken
inside yet or it would be clanging more often or all the time."

Has anyone heard this before?

Thanks
Big E
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Dennis Lloyd
Visitor
Posted on Wednesday, September 12, 2012 - 12:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

water leak in perkins 4108 marine engine. replaced water pump and hoses still leaks but no signs of any water leakage. i have to fill up with about 2 litres each morning after using the boat. No water in the oil. any ideas
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oslin04
Senior Member
Username: oslin04

Post Number: 66
Registered: 10-2006
Posted on Wednesday, September 12, 2012 - 01:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Big E, I suggest you have some air going through an or all the injectors, check all the pipe fittings paying attention to any over tightened fittings/olives and pipes, which can give you a slight air leak on the suction side of the pump back to the tank, if it was on the pressure side you would see it.

Dennis Lloyd, re your water leakage it might be a head gasket do a compression test and see if one is down, with the absence of any external leaks you must look to the gaskets, also I take it you have checked the water pump seals and you are not getting a higher level in the sump pan?
if you are not then the water must being going somewhere, could be being burnt off on the head if the gasket is gone and leaking in to the combustion chamber?
hope this helps :-)
Keith Marine Engineer.
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Charles Wayne Purdy
Visitor
Posted on Wednesday, September 12, 2012 - 05:40 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Just a note on the multi weight oil.
Some of the older engines do not like it. In some cases they will slobber on it.
I was going to rebuild an engine and asked advice of a mechanic on having it done. Told him what was going on. He asked if I had changed from the 30 weight oil to munti grane and on my saying yes he told me to change it back and in a few hours all would be well. Several 100's of hours later the engine is still going strong and no slobbers.
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mooreabc123
New member
Username: mooreabc123

Post Number: 1
Registered: 11-2013
Posted on Friday, November 08, 2013 - 10:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi, can anyone tell me what size the copper pipe is that runs in front of my perkins 4108 for the fresh water cooling

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