1998 johnson 3 cylinder 35 hp

[hidef]

Re: 1998 johnson 3 cylinder 35 hp

If you can smooth out the shaft then all you would need are the factory parts to make it right.

331465 — NUT, SHIFT ROD CONNECTOR
325624 — CONNECTOR, SHIFT ROD
325625 — KEEPER, SHIFT ROD, UPPER TO LOWER x 2

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

I believe i've come up with a fix for now until the shift rod parts come in. went to lowe's and found these in the electrical section. I tested the bond on a 1/4" metal rod and i couldnt pull them free when the one end was locked in the vice and me pulling on the other. tested shifting in and out of gear in my barrel at least 50 times without any slippage or failure. I did check to make sure the shift detent was dead center in neutral.

after replacing the water pump, its a night and day difference. Now i see why the thermostat wasnt installed - it has better water pressure from the pisser at idle than it did at half throttle cruising before!

any reason this linkage wont work temporarily?

 

[boobie]

Re: 1998 johnson 3 cylinder 35 hp

Good engineering, if it works, use it.

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

another question - i found a short shaft driveshaft for cheap. rather than buy a jackplate, i believe itll be much cheaper to just convert this to a short shaft. does anyone know the part number for the bolts that would connect the lower unit to the midsection directly without the extension installed? i cant find the part number on the parts breakdown.

 

[hidef]

Re: 1998 johnson 3 cylinder 35 hp

I believe you will use the bolts that hold the lower unit to the extension. When you remove the extension the lower unit will attach directly to the mid-section using those bolts you will need to get the shorter shift shaft.

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

so the mid section is threaded the entire way up? the extension is only held on by one bolt, and the 4 long lower unit bolt go through the extension, into the mid section and lock the extension and lower into the mid section.

 

[hidef]

Re: 1998 johnson 3 cylinder 35 hp

My bad, you will need 6 bolts item 76 part # 0337096 to do the conversion. The longer ones are item #77 you should already have two of the 76s i believe.

OEM Parts

 

[racerone]

Re: 1998 johnson 3 cylinder 35 hp

Might be cheaper to cut the bolts you have and rethread them.----Or some metric stainless bolts from the hardware store.

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

sounds like a trip to tractor supply is in order. thanks guys

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

possibly another change of plan - it appears they make a jet lower unit for this motor which is what ive wanted the entire time for fishing certain areas on the potomac. approx what is the crankshaft horsepower? looking at a chart to determine boat weight, it list older crank shaft vs prop. i know the 140 became a 110, 235 became 175, and the 35 became 30 when they switched to prop rated hp - i was using a conservative 85% and came up with 42 hp at the crank shaft, which would make approx 28 - 30 hp at the jet with a 30% power loss while converting to jet.

do you believe this motor with a jetpump would push my 1648 adequately? i never fish with more than one other person, as it gets cramped.

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

One of these days ill get everything worked out so I can quit asking questions, but until then, I have another. Gander mtn had the vertical extension in stock for less than the drive shaft and shift rod, along with my desire for a jet so I got one. Hows this motor height look? I have about .75" to lower and 2 more holes to raise if needed.

 

[jbjennings]

Re: 1998 johnson 3 cylinder 35 hp

Hard to tell without a side view, but looks perfect from here to me. Now your bunkboard supports..... another story...

SOrry, couldn't resist. Really, though, do you have any problem with torque steer in on that motor? It looks like unless there's a curve cast into the trim tab, it's not turned enough. Just curious....
JBJ

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

yeah, those are next. gotta take the boat off - just bought an impact wrecnh today, so it wont be an issue anymore!

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

no torque issues at all. Can take your hand off the wheel and it tracks straight. Here's the best I could do side view since its dark.

 

[jbjennings]

Re: 1998 johnson 3 cylinder 35 hp

That's for sure as high as I would raise it. I think you could actually get away with raising it an inch as far as cavitation, but the torque on your transom would be worse due to leverage. It probably would also blow out on curves and such if you raised it any further. I would keep an eye on your transom corners to look for stress cracks. If you get them, you can easily have someone with an aluminum welder beef it up.

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

i was concerned also about the torque on the transom. i did stand on the cav plate and put a little bounce on it and it was dead solid. doesnt hurt that the boat is a 2013 and its a slit rear seat so it has bracing for the entire length of the transom. would there be any benefit to getting aluminum sheet and putting it on the inside of the transom, and bolting a 2 x6 between the two?

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

took the motor for a test drive today - brrr! it ran best with the cav plate just slightly below the bottom. trim most certainly had a less effect, it did pick the boat up so the spray was coming off the boat just about the back seat before it started to lose bite. picked up a few mph, and recorded a best speed of 32.7 mph and 5900 rpm. much better holeshot and mid range response with the motor raised. what can be done prop wise to increase the bite when trimming up?

 

[hidef]

Re: 1998 johnson 3 cylinder 35 hp

You could go to a 15" stainless prop. The stainless prop will have more cupping and which will allow it to bite better. Your performance numbers are pretty good you are right where I am with my 15' Starcraft.

 

[JoshKeller84]

Re: 1998 johnson 3 cylinder 35 hp

that was actually with my 15p solas stainless prop - perhaps i need to have some cup added?

 

[Dwight3us@yahoo.com]

I have no spark on any cylinder. I removed the oil pump and hooked the fuel line to the filter. I have good electricity coming from the stater to the power pack. But nothing coming out of pack to coils.So I then replaced the power pack and I still have no spark on any cylinder. Is there something connected to the oil pump that was removed that is causing my problem? Ron

Dwight3us@yahoo.com