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    What is involved in porting a 90 HP Chrysler to increase horsepower?

    I have seen a photo of a 90 HP Chrysler with the intake ports enlarged. The man who posted it claimed noticeable HP increase, 10-15 HP increase. As best I can tell, the cylinder head and pistons will have to be removed. The ports are then Dremeled from round to a larger rectangular shape. (See...
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    Identifying Timing Marks On A 90 HP Flywheel

    Motor: 1975 90HP Chrysler 3-Cyl. I'm doing a static timing check. The Clymers manual says to line up the 32 deg. mark on the flywheelwith the indicator on the tab. There is mention of a decal on the flywheel. On mine , the decal is either missing or it's covered with melted resin from the fire...
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    What Will A Flow Meter Tell Me About A 3-Cylinder Chrysler?

    I have a carburetor flow meter that reads the volume of air taken in at each carb while it's running at idle speed. Obviously, this meter is no good for anything above idle. The meter reads in dm(cubed) per minute. And I was wondering if marine mechanics use an instrument like this for...
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    Adding A Telltale To A 1975 Chrysler 90 HP

    This is a description of how I added a telltale to a Chrysler, and materials used. 1. Removed 1/8 NPT slotted plug on top of cylinder head. It came right out using a regular screwdriver. Some are difficult and may take an impact screwdriver or a torch heating the head up a bit. 2. Installed...
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    1975 Chrysler 90 HP Fuel Dripping From Carbs

    I've got a 90 HP Chrysler on a stand. I hadn't run it in about a year. I tried cranking it and it won't start. No spark. Pullled the distributor and removed and cleaned the points, which look like new, but had a film or residue on the contacts. Tried cranking it again. Plenty of spark, and...
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    What is the minimum wires needed to start a '74 Chrysler 90 hp?

    I have a 90 hp Chrysler on a test stand. It's been over a year since I last ran it. When I last ran it, it was starting and running well. Decided to run it again since I have it for sale. I found a good 3-pole ignition switch, and a push button for the choke: Red wire to Batt terminal Yellow...
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    What Tools Are Needed For Deconstruction?

    I need to get a list of tools together for deconstructing of a deck, stringers and transom in my project boat. I have a saws-all, and a 6" or 7" rotary saw, various prybars, hammers and a few wood chisels. That's all. I need advice on rotary grinder, type of disks and type of blades to use on...
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    What is the minimum needed to remove the inner and outer transom plates (shields)?

    The manual instructs on how to disassemble every single part. I think it is more than what I need to do. What are the parts that need to be removed to remove the inner and outer transom plates (shields)? I've never done this before. The outdrive and the engine have been removed. (Had good...
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    Inspecting and Resealing Lower End, Standard Cobra 2.3L

    I received a lower end seal kit Sierra #18-2671 from MarineEngine.com this week. The kit had (2) small 'o'rings which appear to be #AS568A-108, O.D. 1/2", I.D. 1/4", Cross Section 3/32". I'm not sure where these go, but they aren't used for the shift rod. The shift rod is .3115" diameter. I...
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    How Do I Inspect A Standard Cobra Lower End? 1987 2.3L

    The lower end is off of a 1987 Standard Cobra, 2.3L Ford, and separated from the upper unit. With the unit on a bench, I push the shift rod down while rotating the prop CW and it shifts into what I think is forward. I continue to rotate the prop and all is smooth. I then move the rod to...
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    Need Help Removing Lower End From Standard Cobra

    Here's where I'm at (outdrive is still attached to boat): 1. Lowered outdrive and drained oil. 2. Raised outdrive to full up position and removed the mount bolts. 3. Without much effort, the lower unit separated about 5/8" from the upper, then stopped. 4. With a pair of pliers, I attempted to...
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    Winterising Question....

    Is there anything wrong with using windshield washer fluid as anti-freeze to winterise an I/O? Or mixing the washer fluid 50/50 with RV anti-freeze? The washer fluid contains methanol. I have searched another forum on this and only came up with a few posts that didn't answer the question.
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    Water Out Of Prop When Back-Flushing OMC Cobra Drive 1987 2.3

    1987 Cobra, 2.3L Ford. Disconnected the water infeed hose (long one from transom) at the thermostat housing. Clamped a garden hose connector to the infeed hose. Turned on the water to back-flush back to the outdrive water intake. Water not only comes out the intake, but there is a small stream...
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    Outdrive Showers

    Learn something new every day on these I/O's........ Apparently, some I/O owner/operators are installing external cooling systems to cool the upper gear drive while the boat is on a plane and above the water. They claim it is a good thing to decrease gear case temps. If there is a problem...
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    What's the Procedure For De-Carbing A Four-Cycle I/O Engine

    I have used a de-carbing method on two of my 2-cycle outboards using Seafoam. The motors ran better after doing this procedure a couple of times. It is suppose to loosen up the carbon in the combustion chamber and piston rings. I used approx. 8 oz. of seafoam in one gallon of fuel. Ran the...
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    Are Exhaust Tubes A Good Idea?

    While R&R'ing my OMC Cobra outdrive (2.3L Ford), I read about something called "exhaust tubes". IIRC, these take the place of the exhaust bellows. The exhaust then no longer flows thru the outdrive and the center of the prop, but exits at the pivot housing/bell housing. Is this a good idea and...
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    Re-installing A Standard OMC Cobra Outdrive

    I received a new outdrive alignment tool via UPS today. Nice looking tool. Heartland Products. I tried it out and the tool wouldn't go into the coupling. I had previously raised the front of the engine, playing around before the tool arrived. ( I now suspect there may not have been anything...
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    Missing Flapper On OMC 2.3L Cobra

    I removed the exhaust riser and exhaust couplings in order to inspect the flapper and install a new riser gasket as preventative maintenance. The riser unbolted with out a problem and inside it looks very good. The old gasket was not leaking, but was rock hard and "petrified". It took some...
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    Can A Clogged P/S Cooler Cause Raw Water Back Pressure?

    While back flushing out my 2.3L Cobra from the raw water hose on the thermostat housing back to the raw water intake, I discovered (8) dime-size or larger pieces of embrittled, old impeller pieces which apparently were stuck in the intake side of the P/S cooler. These fragments no doubt impeded...
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    Replace Broken Temp Sender With What? (1975 Chrysler 90 HP)

    I have got a 1975 Chrysler 90 HP O/B (3-cyl) with a broken thermo switch. The switch has 1/4-20 threads and mounts on the top cylinder near the spark plug. Takes a 5/8" socket to remove it. If the motor overheats, the switch is suppose to ground out the horn. Is there an inexpensive...
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