Is it a Perkins 4.107 or a 4.108?

Author Message   Axel Nagel Posted on Monday, August 19, 2002 - 08:38 am:    Hi. I just bought a older boat with a Perkins 4 cylinder fresh water cooled diesel engine installed. It is supposed to be a 4.108 55hp from 1982, but I am not sure now. Found the engine number on the engine block just where the injection pump is mounted. The number is: 7112958. Can anyone give as much info as possible (Type/hp/year) on the engine I have? Thanks in advance.   Andrew (Andrew) Posted on Saturday, November 09, 2002 - 10:18 pm:    Axel, Perkins engine numbers should be a combination of up to fifteen letters and figures. Your number doesn't seem to fit their Engine ID sysytem. Regards, Andrew   roy abrams Posted on Friday, May 07, 2004 - 05:24 pm:    hi perkins made one engine which i own one without the 4 108 or 4 107 sufix no on it 4 means 4 cyl 107 means 107 cubic inches 6 354 is therefor six cyl 354 cubic inches and so it goes but 107s have smaller head studs 3/8 inch 108s are slightly bigger 7/16 if yours are 7/16 with 4 separate cold start plugs in the head its a 108 inch but later model no plugs in the head then????   johnhamilton Visitor Posted on Sunday, February 26, 2006 - 11:53 pm:    My Perkins 4.108 has become difficult to start, & when it does finally start it is running unevenly, struggles to build up revs & surges back & forth mildly. I have ruled out a fuel problem, new filters have been fitted etc. there seems to be more blue smoke exiting the exhaust. I fear the rings may be shot....has anyone got any ideas? John Hamilton.   kelly foyle Visitor Posted on Tuesday, July 22, 2008 - 03:41 pm:    hi can anyone help? i have a perkins 4107 in my boat it is approx 35yrs old the diesel injection pump has broke can anyone point me in the right direction on getting another one. A few people have told me i have no chance as spares are not made anymore for the 4107.   Camping Classic Visitor Posted on Friday, August 08, 2008 - 07:10 am:    Early Perkins engines used engine numbers as you discripbe. Numbers starting wiht 73 is 4.108, and 71 is 4.107 engine. See workshop manual at http://www.capedory.org/manuals/Perkins-4.107_4.108_4.99-WorkshopManual.pdf According to this manual from 1983 the current engine number system is 15 letters/numbers, and there has been another engine number system inbetween the current system and the number on your engine. Don't know when these numbers have been changed, but i doubt your engine is a 1982 model when it's got this enginenumber.   david pasacreta Visitor Posted on Friday, September 26, 2008 - 07:25 pm:    I have 1973 sailboat with a perkins which is leaking water from the water pump gasket.Is this an easy fix, is it just the gasket?   rob noll New member Username: old_bear Post Number: 1 Registered: 04-2009 Posted on Tuesday, April 14, 2009 - 08:52 pm:    Please help! We have a old 4-107 in our boat,and Im afraid its a dead soldier.So we found a good 108 long block. are my parts going to be inter- chanable? ie.fuel pump,injectors,exc? thanks.   Mark Barmettler New member Username: kemosabe2 Post Number: 1 Registered: 07-2009 Posted on Thursday, July 23, 2009 - 12:49 am:    I have a 4 236 perkins in my 1975 Morgan sailboat. It sat on the hard for a few years before we got it. I refilled the fresh water system with 50% antifreeze. I put in the kind that is compatable with aluminum. I ran it for a couple of hours with no issue. Then I did not run the motor for about 6 to 8 weeks. When I started it, it ran fine but started to overheat. I had good cooling water flow overboard. After it cooled, I opened the reservior on the front of the engine and discovered crystals that seemed to be antifreeze. They are about 1/8" + - in size and will crush and turn to a kind of grity mush between the my fingers. Some are harder than others but all will crush with very little effort. I have not found anything that disolves them ... so far. I removed the heat exchanger and found it packed with the crystals. I flushed the system and had the reservior and heat exchanger cleaned in a machine shop. I refilled the system and ran it regularly for about 6-8 months then let it sit for a few weeks. Once again it overheated next time I started it. Again I have the crystals. My questions are: Where do the crystals come from and what causes them? How can I make sure that they are all out of the system? How can I avoid them in the future?   Valere ORTOLI New member Username: caimanrouge Post Number: 2 Registered: 07-2009 Posted on Friday, July 24, 2009 - 04:11 am:    As you refilled your system with 50% antifreeze, maybe your fresh water is to be incriminated. i suggest refilling your cooling system with undiluted coolant(if not already done). My 4108 runs with standard car coolant and does not produce any crystals in the primary cooling circuit. It is not the same in the secondary system (sea water ) that needs to be cleaned of tartar deposits.   Dwight Brooker Member Username: sailmaster Post Number: 96 Registered: 05-2006 Posted on Friday, July 24, 2009 - 08:40 am:    Not sure about the crystals, they may be just left behind from the antifreeze evaporating. There may be a slow leak somewhere, check the water pump seals. Have you removed the thermostat and checked it. I would replace it and flush the system with it out by using a recirculation pump tied into the system. This can usually be done by tying into the hot water tank in and out hoses if so equipped. If not tie into the system somewhere else. Use a 20% solution of Muriatic acid and re-circulate it for 15 minutes. This will clean any organic deposits like rust, salt and minerals. The previous owner may have just used water and caused corrosion. I know you said that you ran the engine before with no issues but did you have it in gear and under load? My guess is the there is a block in the system that may let you idle it but would have overheated when under load. I have seen this quit often. Replace all the hoses to make sure they have not damaged inside. When you refill the system just use regular premixed 50/50 antifreeze. One other thing, have you checked your raw water pump impeller and are you getting good flow out the exhaust?

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