120 Chrysler no power

[89retta]

The engine was running fine.No power from half to wot.I have cleaned carbs,checked timing 32 btdc.Compression is 130 on all 4 cylinders.New plugs good spark.Its got a magnapower iv ignition system with a pre-amp instead of points.I'm thinking it might be the reeds.Any help would be great.Thanks

 

[nathanhooper]

Re: 120 Chrysler no power

Have you tried pumping the primer bulb while running?

 

[89retta]

Re: 120 Chrysler no power

yes

 

[jerryjerry05]

Re: 120 Chrysler no power

Ethanol is messing up a lot of motors.It's delaminating the inside of older hoses causing clogs in the carbs and fuel filter.Check for soft hoses and junk in the filter on the motor.Check the diaphram.J J

 

[89retta]

Re: 120 Chrysler no power

I have checked,It is getting fuel,idles real fine runs good up to about half throtle.Then you go past half and nothing still runs like your at one third.There is fuel dripping from the front of the carbs.

 

[89retta]

Re: 120 Chrysler no power

I forgot to ad that when i pulled the new plugs they were very black and oily.Cleaned them took the boat back out.Still no power pulled the plugs and they were all really clean.Thanks for any help guys.

 

[Frank Acampora]

Re: 120 Chrysler no power

It would really help to know the size of the hull, the RPM, and the speed you are getting. Engine year and Prop pitch would also be nice.

However: You MAY be running rich, so it is time to pull the carbs and clean them. Check the inlet needles for wear or sticking and re-set the float height before reinstalling the carbs. After installation, re-synchronize the timing and carb opening.

It is also possible that you are running rich at part throttle and running out of fuel at full throttle. So, for that reason, replace the diaphragm and gasket in the fuel pump and clean the button valves with WD 40 or similar sprays. Check the fuel system for restrictions and clogs from the tank pick-up to the carbs.

Please understand, though--and this is why top speed figures would be nice-- speed is not directly related to throttle position. That is, it is not linear. After about 1/2 to 3/4 throttle, the butterflies quickly open fully, the engine uses a lot more fuel, makes a lot more noise, and speed will only increase about 2 MPH.

If you look at the throttle cam as you open the throttle, you will see that up until a certain point the throttle will only open partway, about 1/4, while timing is almost fully advanced. This is the "cruise" position and usually results in close to the best fuel mileage. After this, the "finger" on the cam rapidly opens the butterflies to wide open position. It is important to adjust the link on the cam so that the butterflies are opening substantially fully at WOT position.

 

[89retta]

Re: 120 Chrysler no power

The hull is a 76 crestliner crusader,the engine is a 73 120hp with 17 pitch prop.Speed was around 37 to 42 mph.No tach so dont know the rpm.I just did the carbs last friday to see if that was the problem.And checked the timing.The problem is still there.Only getting about 5 mph out of it now.I'll check the fuel pump next time.It sounds like she's spinning around 2000rpm alot less than before.If it was the fuel pump wouldnt the engine rev up when i squeeze the primer bulb.

 

[bman1bpm]

Re: 120 Chrysler no power

Its the crestliner-chrysler curse! haha I've been having a mess of trouble with mine this season. Unfortunately, I'm not sure how to fix your problem. Good luck!

 

[89retta]

Re: 120 Chrysler no power

Any ideas

 

[Frank Acampora]

Re: 120 Chrysler no power

Is the link from the timing tower to the distributor still intact? Or, perhaps the pivot screw loosened and fell out of the distributor. This assembly is the two black plastic pieces with a 1/4 threaded adjuster and locknut. It slides onto the linkage tower and a shoulder screw holds the other end to the distributor. If it is broken or missing, the distributor will not turn as you advance the throttle and timing will not advance--no power, even with throttles wide open

While you are at it, check to be certain that the distributor body is free and lubricated.

 

[89retta]

Re: 120 Chrysler no power

Got her running but now its revving but no go sounds like a tranny slipping in a car.Pulled the screw for the lower leg and there was about 7ozs of water that came out with the oil.Would this cause the slipping?

 

[89retta]

Re: 120 Chrysler no power

I forgot to add that the last time i was out the snout above the prop came off.Would this cause the slipping?

 

[foodfisher]

Re: 120 Chrysler no power

Having fun yet? Slipping could be a spun prop.

 

[89retta]

Re: 120 Chrysler no power

Help.Back to square one.Prop slippage solved reinstalled the exhaust snout.Fuels good,timing is good and the distributor rotates freely and properly.Could it be a problem in the lower unit.Should i be able to turn the prop with the engine in gear?

 

[itzmepete]

Re: 120 Chrysler no power

I got a 99 120 Force. Had fuel problems. The inside of the fuel line was deteriorating as stated before. I cleaned the tank, cleaned the connectors as it had build up in there, replaced ALL the lines including the line inside the outboard that goes from the connector to the fuel pump and then to the carb and the fuel filter. Also, my two carbs needles were worn causing one carb not to seat and fuel leaking out. Check the needles, $8 each, and all lines. I got a 12ft universal line and primer bulb, way too long but cut to length, used excess to replace the short line from the connector inside the outboard housing to fuel pump, then regular auto fuel line to replace the rest. Also look inside the connectors, use a small plastic or wooden dowel to push open the check valve and blow it out as well as use some cleaner like carb cleaner. Mine was full of deteriorated fuel line and the line outside looked good. Runs fine now. I replaced the fuel filter and got a new diaphram for the pump but didn't change the diaphram as it worked and found the problem. Hitting or pushing the key in to add fuel may not work if its clogged with deteriorated fuel line. Check the primer lines and solenoid. You may try running it with the cowl off and have someone spray some starter fulid when at WOT to see if it picks up. If it does if lack of fuel. Don't hit the starter fulid for more than a few seconds as it doesn not have oil and you can lean out your engine! Hope this helps.

 

[89retta]

Re: 120 Chrysler no power

I have checked my fuel system.Read in my seloc manual about a trip regulator cutting back power to the system but still give enough to make it back to shore.Page 4-46.But i cant find it on my engine to test it.Before all this started i had jumped my solonoid to get the starter to engage,Could i have fried this regulator?

 

[itzmepete]

Re: 120 Chrysler no power

Dont know anything about a trip computer but I DO know that if the carbs leaking fuel the carbs needle is NOT seating. Replace them, easy and cheap. My 1999 had rubber tipped needles and they were worn. Had a slight groove around the rubber tip. Its not hard, I didn't even remove the carb. A easy trick is to dab a little grease on the new needle when inserting it into its hole. The grease will hold it up there letting you reinstall the float easily with the carb still on the engine and right side up, otherwise its a battle. The grease comes off once fuel hits it. Just a little wear on the tip of the needle or seat will make them leak. Off and on at first then gets to the point where its always leaking. My engine ran damn crazy with that bad needle, from one day to the next. Black oily plugs are signs off too rich a setting, burning too much gas. Plus, leaking carbs are a fire hazard not to mention gasoline fumes under the cowl can cause an explosion during starting and poof it comes off and up like a rocket. You sure the primer (choke) solenoid is not stuck open, leaking by etc?

 

[89retta]

Re: 120 Chrysler no power

Update the problem was the regulator.It had a split in the back and was shorting out to the block.Changed it, now it goes like a bat out of hell.Wonder if it was shorting out for awhile.The boat has way more power now.