Overheating Perkins 4.108M

Author Message   Vincent Posted on Tuesday, April 20, 2004 - 01:34 pm:    Hi all !! I have a Perkins 4.108M that only overheats when a thermostat in installed. I have tried serveral new thermostats 140,160,180 and they all cause the engine to heat above 200. When I remove the thermostat and run without one, It runs fine (under 120) Thanks for the help!!!! Vincent NYC   Marv (Marv) Posted on Tuesday, April 27, 2004 - 06:43 pm:    120deg is way to cold,engine should run around 185/190deg /f or 197/208f depends on what thermost you are useing.what temp has it run in the past? did you just do eny work on the engine and this starerd after it?   vincent Posted on Thursday, April 29, 2004 - 02:51 pm:    Marv, Thanks very much for responding to my post! You are correct in your assumption that I have done some recent engine work! I had to remove the header tank in order to re-config some wires. The problem is that when i put in anytype of thermostat the engine ends up overheating (above 210) However, when I run the engine without one it runs cool (below 120) Do you think i have some air in the coolant lines? Thanks much Marv!!! Vincent   Rudi Matt Posted on Wednesday, May 05, 2004 - 01:04 pm:    My boat with a Perkins 4.108 was recently motored over a distance of 30Km (maiden voyage for vessel under new ownership). The engine ran well for about 3 hours at 2200 rpm. When rpm's were raised to 2500rpm, the temperature started to climb and overheated in a matter of minutes. I was watching the temperature gauge. When it climbed over 210F, the engine was backed off to idle, but the temp continued to climb to the top end of the temp guage. The engine was shut down at that point, and immediately after, we noted fumes coming from the engine compartment. Antifreeze was noted in the catch basin under the engine. Not sure what has failed in the 'fresh water' loop, or if the failure was caused by the overheating or visa versa. The sea water loop appears to be functioning properly. Where are the drain plugs on the fresh water loop? Can't locate it (them) in my manuals? Any Canadian/Ontario sources for parts, service support, information?   roy abrams Posted on Friday, May 07, 2004 - 05:57 pm:    is your temp gauge working correct   poker casino479 Visitor Posted on Monday, March 06, 2006 - 02:36 pm:    poker casino poker 612   SteveRockel Visitor Posted on Thursday, June 01, 2006 - 11:31 am:    We are having the same problem with our Pekins that has less then 100 hours on it. If you come up with a solution or a suggestion let me know because we've tried everything. Ours however still runs hot even without a thermostat.   Dwight Brooker Member Username: sailmaster Post Number: 13 Registered: 05-2006 Posted on Thursday, June 01, 2006 - 12:35 pm:    Sorry to hear that you are having problems, but it very simple to track down the culprit. You have to go through a process of elimination. 1. Check your sea strainer and through hull valve. 2. Check your raw water impeller. (If it is damaged, replace it, the broken pieces will be lodged in your transmission cooler and your engine cooler so they will have to be removed and cleaned. It is possible that a prior owner replace an impeller in the past but was to lazy to pull the coolers. Use muriatic acid for scale and build up and remove rubber pieces by hand. Do not poke things into the coolers) Lubricate new impeller with dish soap before replacing. 3. If have removed the thermostat make sure that it has not been put in backwards. 4. The engine cooler will have a zinc anode in it replace it after cleaning. You can leave it out to bleed the system then replace it. Make sure you have plenty of flow over the side. 5. It is not normally a good idea to rev the engine as high as it will go, 2000 rpm is good after that you get minimal speed increase and burn allot more fuel and stress the engine. Once you have completed this you should be good to go. If not flush the block with muriatic acid or other engine flush and chase with water away. Do not leave acid in the block to long. Good luck.   Detlev Purmann New member Username: detlev Post Number: 1 Registered: 06-2006 Posted on Monday, June 19, 2006 - 07:56 am:    Hello, In my vessel a Perkins 4.108 will be installed. Approx. 25 years old. I'm locking for some collectors for the starter of the engine, it's a LUKAS 456 (Art.# 262 49) with the Article # 542 474 97. Attached you will find a drawing from this part. The production are stopped in 1999 from LUKAS. Maybe you could help, or you have an idea of a source. Best regards   Detlev Purmann New member Username: detlev Post Number: 2 Registered: 06-2006 Posted on Monday, June 19, 2006 - 08:20 am:    Here is the attachment drawing Collector.pdf (18.2 k)   Joe lassiter Visitor Posted on Friday, December 21, 2007 - 11:27 pm:    I have 2 4.108's. One with 14x12 prop runs 2200 rpm max and will slowly overheat. If I hold the speed to 2100 rpm it will stay under 210 F which is OK. The other has a 14x11 prop and runs 2600 rpm and will slowly over heat, but at 2400 it will not. I am supposing that h when then engine speed is contolled by the prop, it runs hotter, but if you back off a bit, it it controlled by the throttle and with the leaner mixture it runs cooler and saves fuel.   MIKE WENDELL Visitor Posted on Wednesday, February 20, 2008 - 12:32 pm:    I have a 79'4108 that would heat up after an hour or so. the fix was to install a new heat exchanger and a new oil and trans cooler. My engine now runs at 183degrees. My friend also had my same problem, his engine would heat up in 5 to 10 minutes.He made these replacements and now his boat runs at 180degrees. I was told to first check out the exhaust elbow. I did and it was fine. It was a cheaper fix but that wasn't my problem. GOOD LUCK...   Norman Wathey Visitor Posted on Sunday, April 27, 2008 - 01:16 pm:    Hi, I own a 16 ton 39'Sail Boat with a 78/79 M4108. I experienced the problem that whenever it was above 2200rpm the heat alarm would go on. For years we could not figure it out. Last year we happened to make adjustment to change the fan belt and alternator and since then the problem is gone. Interestingly the perkins recommended fanbelt was too tight. We got a slightly bigger one from NAPA. Hope this helps.

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