Chrysler 35hp problems

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
I recently bought a 14' Jon Boat with a 35hp Chrysler 2 stroke outboard on it. Motor runs great but has trouble getting into gear. I can milk the throtle and sometimes it will catch and go into gear. Other times it takes forever for it to catch even at higher RPMs. It has no problems going into reverse. Im not real familiar with outboards since this is my first boat. Any suggestions on what this could be? The boat itself is a 74 not sure what year the motor is. Any help would be greatly appreciated.
Kerry
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: Chrysler 35hp problems

If it has remote control disconnect the cables and see if it shifts by hand.
If it shifts by hand you may have to adjust the cable or replace it.
Allways shift with the motor at lowest speed possible.Shifting at too high a speed will prematurely wear the clutch dog.Shift crisply neither dragging it into gear nor jamming it in.
My manual doesn't discuss shift linkage but it no doubt need some sort of allignment or adjustment in the course of installation.
Someone should be along with more info.
 

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: Chrysler 35hp problems

Try taking off the lower unit and checking the lower shift rod. 4 bolts hold it and the shift rod must be disconnected (see below). Sometimes silt and sand pack in the front of the leg (because there is no drain there) and jam up the shift rod. Sometimes the seal swells and does the same. Because of the number of bends and length of the shift mechanisn, there is compliance in the system and any drag will show up as difficulty going into forward gear. Typically, reverse has no problems. If you remove the shift cable (the one with the smaller SS quick connect end) and try to move the lever by hand, it should move smoothly and relatively easily--you should not need to force it.

Now, this assumes that the linkage is properly adjusted. When you remove the mid leg shroud (six screws) you will see a hex coupler and jam nut This coupler is threaded in opposite directions on each end. Turning the coupler one direction lengthens the linkage and the opposite shortens it. Be sure it is relatively centered on the two shift rod threads. Adjust it so the linkage and dog clutch is centered when in neutral. The way to do this is to lengthen it while spinning the prop, until it is in forward gear while in neutral, then shorten it till it comes out of gear and you don't hear clicking as you spin the prop. When you do this, be sure the cable and upper shift lever are in neutral position. This will actually bias it slightly toward forward and ensure positive engagement. Remember, there is some compliance in the cable also.
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: Chrysler 35hp problems

Between the power head and the lower unit is what is called a motor leg. There should be 6 bolts and nuts holding the two covers on for the motor leg. Inside you will see the shift linkage that goes from the power head to the lower unit connected by a nut that looks about 2 inches long. This is a strange nut and it is used to adjust the shifter. One side of this nut has smaller threads then the other side and also one side has reverse threads while the other side has forward threads. Best Place to start is to put shifter in neutral and turn prop both ways with a finger. Should be no clicking and should freely spin in both directions. Have someone slowly advance the shifter forward while you are turning the prop with your finger till you feel and or hear it engage and then mark that spot. Go the other way towards reverse till the same thing happens. You want the forward and reverse to be equal distance from neutral and adjusting that nut will make it go one way or another. Some lower units can be real touchy. I have troubles getting reverse with mine but I prefer to hit forward so I over adjust it in that direction.
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: Chrysler 35hp problems

Frank you must type about 50 words a minute cause you keep beating me by about 2 minutes.
 

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: Chrysler 35hp problems

Actually it took me about 15-20 min to type that reply. It's just dumb luck.

BTW what I did was to drill two 1/8 inch holes on either side of the lower shift rod to let water pressure blow crud out of the front of the case (Above the oil chamber, of course.) My shift rod was practically glued tight by silt packed in there.
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

Try taking off the lower unit and checking the lower shift rod. 4 bolts hold it and the shift rod must be disconnected (see below). Sometimes silt and sand pack in the front of the leg (because there is no drain there) and jam up the shift rod. Sometimes the seal swells and does the same. Because of the number of bends and length of the shift mechanisn, there is compliance in the system and any drag will show up as difficulty going into forward gear. Typically, reverse has no problems. If you remove the shift cable (the one with the smaller SS quick connect end) and try to move the lever by hand, it should move smoothly and relatively easily--you should not need to force it.

Now, this assumes that the linkage is properly adjusted. When you remove the mid leg shroud (six screws) you will see a hex coupler and jam nut This coupler is threaded in opposite directions on each end. Turning the coupler one direction lengthens the linkage and the opposite shortens it. Be sure it is relatively centered on the two shift rod threads. Adjust it so the linkage and dog clutch is centered when in neutral. The way to do this is to lengthen it while spinning the prop, until it is in forward gear while in neutral, then shorten it till it comes out of gear and you don't hear clicking as you spin the prop. When you do this, be sure the cable and upper shift lever are in neutral position. This will actually bias it slightly toward forward and ensure positive engagement. Remember, there is some compliance in the cable also.

Thanks for the detailed write up. I took it apart and the rod does not shift smoothly. Ive got the lower end of the motor off and was trying to figure out the easiest way to clean the sand and silt out. I dont want to start taking it apart unless I know what to do. Also, what kind of oil do I put back in?
 

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: Chrysler 35hp problems

What I did was to dig it out with a long screwdriver while flushing with a garden hose. Don't worry, there is nothing down there around the shift rod to damage. After cleaning, if it is still tight, then you need to replace the shift rod seal. This seal is the same on all larger Chrysler and Force engines so if they say they can't find it, ask for a shift rod seal for a 84-89 Force 85 hp. You screw in a large lag screw and pull out the old seal then press in the new one. Pay attention to which side is up.
Lower unit oil is standard marine GL 80-90 weight. or 85-95--However it comes. Wal Mart sell it as do most auto stores. You can buy the squeeze tubes or the quart bottles.
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

thanks for the help guys. Got it all cleaned out, put back together and adjusted properly. Everything appears to be working great tomorrow. We will see tomorrow when I try my luck at some largemouth fishing. Thanks again
Kerry
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

well if its not one thing its another. Today I was out on the lake and everything was going good. After about 2min of top speed the motor started bogging down and eventually quit. Once I got the boat back to my house I started looking at it. Before the boat shut off I could use full throttle. Now back at my house the throttle wont even barely open up the butterfly in the carb. Seems like something is jammed up underneath the sprocket that the starter meshes with. Its got good spark, seems to have decent compression. So obviously its not getting fuel. Any suggestions on what could be jamming the throttle up?
 

byacey

Chief Petty Officer
Joined
Jul 20, 2005
Messages
443
Re: Chrysler 35hp problems

The throttle won't open up unless the gear shift is in forward. This is a safety feature to prevent over speeding the engine in neutral.
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: Chrysler 35hp problems

I agree with the neutral thing. However bogging down on the lake sounds more like it overheated on you. What will happen is when it overheats metals expand and the pistons freeze up causing the motor to shut down. A lot of times after the motor cools down it will restart again and run fine till it overheats again. I would verify the impeller is working. I have had new ones with the brass inserts separate from the rubber so the impeller will spin at low rpms then not at high RPMs.
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

Im pretty sure it did overheat. I fired it back up and it was not pumping water out. Where do I get to the pump? How much does a new one run?
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: Chrysler 35hp problems

Remove the lower unit. You will have to remove the motor leg covers to remove the shift linkage. Water pump is sitting on the lower unit held in by either 3 or 4 bolts. When putting a new impeller in put the impeller key in then the impeller. Lower the water pump down onto the impeller then turn the drive shaft slowly by hand clockwise while pushing down on the water pump till it seats. this will put the correct curve on the impeller vanes.

http://www.mercruiserparts.com/images/CHRYSLER/FOB2497/22.png

Iboats sells the impeller here
http://www.iboats.com/mall/partfind...gd_poid=112694&gd_row=13&**********=506310078
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

so what do you think is causing it not to pump water? the impeller is not spinning freely therefore causing it to not spin fast enough? I dont have a clue what year the motor is, the impeller says it will work from a 76-78. Is this definatley what I need?
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: Chrysler 35hp problems

It is a minimum of what you will need. You wont know till you take the lower unit off. You will first want to verify all of the old impeller is still there. If not you will have to find the missing pieces which could be in the power head. Look at the inside of the water pump and look for scoring. If it is scored you may need a new pump. Replace the impeller as mentioned above, put the motor in a garbage can with water and watch for a spray or sputter of water coming out the telltale. If no water comes out after about four or five minutes kill the motor and start looking. Could be a stuck closed thermostat however The impeller is the more likely culprit. I like the six blade impellers but am having problems finding the part number for that. On my chrysler it works better for me , pushes more water and seems to last longer. I have had problems with the 10 fin ones lasting more then one season.

You will have to post a model number to find the year however any of the 35 and 45 hp chryslers will take the above mentioned impeller.
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

well I attempted to get to the water pump today and was unsuccessful. I took the lower end off and tried to loosen the 4 flathead bolts that hold the pump on and could get them to break loose without stripping them. Why on earth are they flatheads and not regular bolts? Anyways tomorrow im goona grab and impact and hopefully that will break them loose. Wish me luck
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

Worked on the motor a bit more tonight and got into the water pump. Impeller looks good and turns easily. Got everything back on and dunked the motor in a big cooler full of water and let it idle for aobut 6-7 mins but nothing squirted out. Correct me if im wrong but should water be spewing out of what looks to be an exaust pipe just bellow the main head? Next I`ll check the thermostat to see if it is closed shut. Any tips on this?
 

eurolarva

Rear Admiral
Joined
Jun 24, 2003
Messages
4,182
Re: Chrysler 35hp problems

Yes water should be coming out the telltale. It is more like an old man with prostate problem but water none the less. It should also be very warm water. At the thermostat some chryslers have a clear hose. Try removing that hose and see if water comes out of the hose. That impeller should still be replaced. The vanes may be pretty limp and not do much for water flow. Also the water tube should fit into a grommet up by the power head and line up and go to the water pump. If you dont have the clear hose remove the thermostat and put the cover back on and try running it without a thermostat.
 

KPatterson

Cadet
Joined
May 8, 2007
Messages
14
Re: Chrysler 35hp problems

The rookie outboard man that I am realized today that the cooler that I had used for testing was not deep enough. Although water was deep enough to cover up where it sucks in water it was not deep anough to fill up to where the impeller was. FINAL VERDICT: Starting on the problem with the linkage I had took the bottom end off to inspect for dirt and what not jamming up the linkage. When I put everything back on I think the key on the driveshaft was not lined up with the impleller correctly. Therefore the first day out on the lake it shifted great but overheated. Once overheating problem occured I took the bottom end off again and inspected the impeller. After determining that the impeller was good I lined the dirveshaft/key/impeller back up and tested it in a bucket of water.... still no water pumping. So today realizing my cooler was not deep anough to reach the impeller I opted for a big rolling garbage can as soon as the engine fired up it started spewing like and old man with a prostate problem:D :D . I guess moral of the story is: you learn from your mistakes! Anyways Id like to thank yall for taking the time to help an outboard rookie out. Although I am no stranger to tools and working on jeeps and such, building and fabricating them from the ground up. Yall still helped me out greatly. Heres a pic I snapped with my camera phone...
Thanks
Kerry
 

Attachments

  • bortboat.jpg
    bortboat.jpg
    57.4 KB · Views: 0
Top