45 Chrysler model 457HF

[Jcrain]

I'm new so please bear with me. I aquired a 45 hp and mounted it on a 14ft chrysler boat. It started and seemed to run ok till I put it in the water. Top rpm was 1200. after tinkering around rebuilding carbs, changing plugs, cleaning puddle valves, adjusting points, it ran a bit better with earmuffs hooked up but it kept flooding out the lower cylendar. And, raw feul/oil was running out the exhaust. Also, at ile, it surges about 200 rpm. I was told to look for an airleat around the carb, but that os fine, no leaks. I am about ready to toss it in the lake. Any ideas?

 

[eurolarva]

Re: 45 Chrysler model 457HF

The raw exhaust leaking into the lake is common with early model chryslers. On the port side there should be two hoses connected to a check valve and then the another hose connected to the spacer plate on the top of the motor leg. That is where the gas is draining into the lake. The newer models incorperated a puddle valve system that recirculated the gas back to be burned. I am not sure which you have. <br /><br />When a motor runs with muffs and will not run in a tank or on the lake chances are you are not firing on one cylinder or you have a bad cylinder. First test to make sure you are getting spark to both cylinders then check your compression. That motor should be blowing about 150 compression.

 

[Jcrain]

Re: 45 Chrysler model 457HF

Thanks, Euro, But I found the problem. The diaphram in the fuel pump was, uhhhhh, missing a few peices. A new diaphram and that stopped the flooding problem. It's hitting on both cyls. now and starts, idles and revs like a dream. However, now I discovered a tach problem. At WOT, my tach said I was doing about 7500 rpm<br />This engine is a battery type ignition with 2 coils. I have the tach hooked up to the ground wire of one of the coils, as the generic instructions that came with the tach. On the 50 horse merc that I took off of the boat, the send wire was hooked to one of the rectifier wires. On the wiring harness with the Chrysler,I have a violet colored wire that says Generator. Would that be the wire to hook to?

 

[eurolarva]

Re: 45 Chrysler model 457HF

The manual calls the white wire as being the tach wire. This is on a 45 hp battery ignition with alternator. The purple wire goes to the AC side of the rectifier. Seems to me I read that chryslers and force motors require a special tach. The problem could be that tach wont work on a chrysler. Glad to hear the fuel pump was the culprit.

 

[Jcrain]

Re: 45 Chrysler model 457HF

Do you happen to know how many "poles" on a 45 alternator?

 

[Jcrain]

Re: 45 Chrysler model 457HF

Do you happen to know how many "poles" on a 45 alternator? My tach says it won't work with the 20 pole model engines.

 

[eurolarva]

Re: 45 Chrysler model 457HF

I know the force is a 20 pole and I am pretty sure the chryslers are as well

 

[fast525]

Re: 45 Chrysler model 457HF

The different type ignition systems on Chryslers take take their on type tachs (Mag I , Mag II , Mag III , points type or electronic etc.)They must be wired to the key switch differently also .

 

[Jcrain]

Re: 45 Chrysler model 457HF

This one is a battery ignition with 2 sets of points, 2 condensers and 2 coils.

 

[fast525]

Re: 45 Chrysler model 457HF

My wiring diagram shows the white wire (tach)wire splitting to two wires at the terminal strip one going to the top coil (- side) and one going to the set of points with the black wire that goes to the altenator

 

[Jcrain]

Re: 45 Chrysler model 457HF

I've got the tach wired to the white wire at the switch. The yach is a "Telex" brand with a rotary switch and a pot for calibration. Since it is a new tach, I would assume that the cal adj should be left alone, or at least until I got the eng reading somewhere in the ballpark. So, here's my idea.... idle the 45 with NO throttle plate opening and set the idle screw at one and a half turns out and switch the rotary switch until I get close. Anybody got an idea what a 45 turns at that setting?

 

[rodbolt]

Re: 45 Chrysler model 457HF

hello<br /> I belive that motor has a 20 pole altenator so you will need a tach with a 20 pole or 10 pulse input. or try to find one of the tiny tach inductive model tachs. chysler was always different and used that 10 pulse set up for years.<br />good luck and keep posting

 

[eurolarva]

Re: 45 Chrysler model 457HF

Idle speed should be around 700-800 rpm. Also this is a very common issue for people that have this motor. If you get it to work please post the model number of the tach here. There are quite a few of us with 45 HP chyrslers. If you post the model number for the Tach then people can find that information when doing a search.

 

[Jcrain]

Re: 45 Chrysler model 457HF

Ok, will do, but may be a few days.

 

[Jcrain]

Re: 45 Chrysler model 457HF

Euro, Tried all sorts of combinations with the Telex Tach, no luck. Seems to either work on the low end and off at the high end or vice versa. Maybe if I'm good, Santa will bring me an inductance type tach for Christmas

 

[eurolarva]

Re: 45 Chrysler model 457HF

I read a post in electronics about a tach that has a piece of reflective material that you attach to the flywheel and the tach will see it. This may be the inductive tach you speak of. I hear they are accurate and can be used for almost anything that spins. If santa leaves the price tag on it let me know how much it costs.

 

[Jcrain]

Re: 45 Chrysler model 457HF

We use a thing like that in the helicopter maint business.But it is only a small part of a system we use to balance rotors. I think the price of that type would be pretty high. I read about a tach called "Tiny Tach" I believe you connect a sensor around one of the spark plug wires, sort of like a timing light. I might look into one of those

 

[DJ]

Re: 45 Chrysler model 457HF

Here is the website for the inductive-"Tiny Tach".<br /><br /><br /> http://www.tinytach.com./

 

[rons45hp]

Re: 45 Chrysler model 457HF

Hi: I have a 45 hp Chrysler mod.4555 ser. 2137 and I need a wiring diagram. Some of the wirers were missing and I can't get fire to the bottom cyl. I think I have some of the wirers cross up. The year is between 1970 and 1975. Please send to Rongrocman@aol.com

 

[Frank Acampora]

Re: 45 Chrysler model 457HF

45 Chrysler with battery ignition is 12 pole alternator. white wire is tach but it is also coil. when hooked up to the tach, you are getting 1 pulse so tach should be set to 1 if it has a switch. If it came off a Merc, it probably won't work with the Chrysler. Regular teleflex or other brands supposedly will. However, I had a 55 which I could never get a tach of any kind to work on. I finally gave up.
If you have a purple wire on the rectifier, hook that up to the tach and set the tach for 12 pole position. (I think usually 3 position)