Chrysler 105 HP

[Gary Elliott]

Hello Group,

I bought a boat with a Chrylser 105 and have had it out 3 times and always the same problem. The engine starts and runs fine at any throttle setting until after about 35 or 40 mins and then starts missing and runs rough. I have replaced the fuel tank with a new plastic one, new fuel filter and still have the same problem. If I turn the engine off and wait and hour or so and start it up it runs fine again until after 30 or 40 mins starts missing.

Any thoughts or suggestions before I take it to dealer to see if they can find out what is wrong ? I have found most dealers do not know much about this engine because it has been out of production for 20 years or so.

How do these dealers really run and test a outboard or I/O for that matter and put a load on the engine like it would be in the water ?

Gary

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[Frank Acampora]

Re: Chrysler 105 HP

Really need to know the year of the engine because Chrysler made gadzillions of 105s with three different ignition systems.
That said, it sounds like a heat related problem--For example: if you have a standard points and coil ignition, it could be the condenser heating up and shorting. When it cools, engine runs fine until it heats again. This is a typical symptom of condenser failure.
The electronic ignition models also are capacitor discharge and could fail in this way. Unfortunately, you need special meters to test these units AND, I doubt you could find anyone to do it anyway. Most dealers don't want to fool with an engine that old. If you take this engine to a dealer who wants to work on it , you will probably be dissatisfied because he will probably throw in some parts, charge you, and not fix the problem.
First thing, come back with the engine year and ignition type.

 

[Gary Elliott]

Re: Chrysler 105 HP

Frank,

Pulled the cover and on the side of the engine it has a tag still in place that had the following information:

Date of Purchase 4-10-74
Model 1057HF Ser# 4969 HP 105

It has a black box which I am assuming is the ignition system that says:

CDI Electronics
Chrysler/Force Type
115-3301

Any thing else I can provide you with ?

Gary

 

[Frank Acampora]

Re: Chrysler 105 HP

That's Motorola CD ignition. They should run warm to the touch but not hot. When the engine cuts out, feel it; if it is uncomfortably hot that could be the problem. If that is the case, you would need to try to borrow a good unit to check. Coil mounted on unit could also be heating and shorting. In 74 I'm not sure if you had signal points or electric eye in the distributor. Electric eye has 2 wires running to distributor, points only 1. there is no way to test the electric eye, so again you would need to borrow a known good one. Even used, these parts are expensive so you really don't want to just go out and buy them willy-nilly.

Also, check where the wires run under the flywheel--sometimes they rub on it and pop the circuit breaker. You have the tin can breaker (silver colored rectangle at the bottom of the terminal board) and it resets itself when it cools down. On these engines, I fabricate a thin aluminum plate to hold down the wires and prevent them from touching the flywheel.

 

[Gary Elliott]

Re: Chrysler 105 HP

Frank,

The more I try to research this problem, the more I am inclined to believe it may be a overheating problem. Would you suggest as a starting point the change the thermostat and impeller ?

I will take a close look at the CD and if you could give me your actual e-mail address I could send you a JPEG photo. I apprecaite your comments and help. I am trying to locate Clymers manual on this engine. I had bought a CD but it was pretty useless and gives not real instructions on how to change parts just how to tear down the power head and how the lower unit. Does this Clymer manual cover a lot of small maintence items like the old Auto Chilton Manuals ? I need something that shows me the location and how to change various parts. I have know idea where the thermostat is located on this engine but there is a housing/mount with 4 bolts on top on the engine near the head and assuming it must be in there ?


Gary

 

[Frank Acampora]

Re: Chrysler 105 HP

You can send photos here; other people might be interested. However, my email is tonyonmemory@yahoo.com.

Thermostat is precisely where you think it is on top of the head. Two bolts will come out easily. the other two go through the head into the water passage and corrode. They tend to be difficult to remove. An impact screwdriver helps. Clymers is reasonably good but there is some small stuff that you just need to figure out yourself. It does have a full chapter on troubleshooting, a full chapter on tune-up, and chapters on all major systems.
To change the water pump impeller, you need to drop the lower unit. There are six bolts outside just above the anti cav. plate and there is one inside the exhaust snout. You need to remove the snout to access it. Depending on your lower unit, It may be a 5/16 12 point head or a regular 1.2 hex head or an allen head bolt. You will see when you remove the snout. If the back of your lower unit drops almost vertically to the cav plate, and the corners of the cav plate are rounded, it has the 12 point bolt.

Be careful when removing the four bolts holding the pump body. On an engine this old they are frequently corroded and tend to snap. My experience is that three come off and just when I think I'll be lucky, the last one snaps. When you re-install, use plenty of anti-seize on the bolts. As a matter of fact, use anti seize on all bolts that have any sort of contact with water. Don't let anyone tell you that the pump impeller is not available. Try the old Merc site or franz marine at the Chrysler Crew.

 

[hellbound]

Re: Chrysler 105 HP

this may sound stupid but did you make sure the gas tank vent is opened?

 

[Gary Elliott]

Re: Chrysler 105 HP

Thanks for your reply, I believe there are no stupid questions. Yes tank is brand new and the vent was fully open.

Gary

 

[Gary Elliott]

Re: Chrysler 105 HP

I have finally sloved the problem I was having with my Chrysler 105. In case anybody else was following this thread. After checking out the fuel system and rebuilding the fuel pump I still had the problem, I found a dealer who was able to put the engine on load rather then just running it with the "Muffs" and it failed shortly. The problem was in the ignition settings, nlo parts were required the CD and coil were fine. Engine is running like a dream now,

Gary

k7ox@msn.com

 

[needaski]

Re: Chrysler 105 HP

Hi sorry to just push in here with my own question but i couldnt start my own thread just yet because im new.

can someone please help me out i just bought this boat with a 105hp chrysler model # 10563 serial #1032 has anyone got any idea of the year?

also when i start the motor ive noticed that i dont have any water comming from the hole in the leg like its not pumping or something?? is this bad?

please help me im new to the boating world..... but loving it.

Cheers

 

[eurolarva]

Re: Chrysler 105 HP

needaski. Your motor is from 1968. When you are running are you using water muffs? If so try using a trash can filled with water. Yes you should get water almost immediately. If you don't I would start with changing the impeller and inspecting to see if the water tube is connected correctly. You really should start your own thread on this. People with one post can start new threads.