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Old 06-19-2018, 05:11 PM   #1
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Default 1992 4.3 to 1999 4.3 swap

I have begun the swap process to put a 1999 Vortec 4.3 block into a 1992 Maxum 1800 SR. I picked up the Maxum with a cracked block and I own a 1999 Stingray with a good motor but no interior. I have a much better chance of getting the Maxum on the water right away.

More to come.
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Old 06-22-2018, 06:18 PM   #2
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Not ready to post pics yet but hope to in subsequent posts. Motors are almost ready to swap. Issues that I have found so far are:
1. Power steering hoses, they use different connectors at the rack and pinion.
2. Power steering cooler, 92 is mounted below block 99 is mounted behind block.
3. Shift interrupter switch, 92 is hard wired to harness so I am disconnecting the cables and leaving the shifter plate with its original engine.

I should be moving engines over tonight so I will be confirming the rest of the issues and cross my fingers wont find more.
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Old 06-22-2018, 07:44 PM   #3
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Yes I forgot they changed steering assist cylinder in the mid 90ís.
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Old 06-24-2018, 06:02 PM   #4
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Power steering hoses and cooler moved over without any issue. I was worried about the fitting at the pump but turned out a non issue.
The engine mounts on the maxim were taller and some kind of isolation mount so they had to be moved over.
The 10 pin electrical plug worked perfect, everything worked.
Fuel filter was tight. New style spin on is larger and sticks out more. We will see if the filter can be replaced without unbolting the bracket.
1999 engine is in and running. A small amount of alignment had to be done and outdrive bolted right up. We are excited to get it on the water. Pics to come.
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Old 06-24-2018, 11:13 PM   #5
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Thanks for the update. Enjoy the season.
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Old 06-25-2018, 02:44 PM   #6
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Quote:
Originally Posted by boisebiker View Post
The engine mounts on the maxim were taller and some kind of isolation mount so they had to be moved over.
Reduces vibration.
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Old 06-27-2018, 05:03 PM   #7
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Well first sea trial didn't go so well. First I remembered I didn't have enough power steering fluid so quick stop at Walmart. Got the boat in the water and first key turn gave a click and then everything went dead. The positive battery cable to the starter was not tight and I think the ground cable to the back of the engine needs to be replaced. We did get it to start and then found water leaks all over the exhaust joints. After tightening all of the clamps again they stopped. Please take note that I had my 16 year old son doing most of the wrenching, time he learns about engines. Filled power steering up and work the wheel, it never gets smooth or easy to turn. Then we pull away from the dock. Idles good, goes into gear no problem and we move out to edge of no wake zone. As soon as I push the throttle forward I head a grinding noise. Didn't hold it long enough to get on plane. Back to dock and we listen for a minute or so. Sound stays constant in forward, reverse or neutral. Back on trailer and we go home. It was successful in that it didn't sink, we found some issues and no one got hurt. Power steering is still a bear to turn and reservoir is full. We turned the wheel lock to lock multiple times with no change. I pulled the top of the outdrive, fluid was a little low and gears look good and no water in the oil.
I think I have narrowed it down to gimble bearing. Need to pull outdrive to make sure. As far as the power steering goes what do I look for? Can I service/rebuild the actuating unit?
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Old 06-27-2018, 09:29 PM   #8
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Sounds like a bad steering cable. You can try lubing the guide tube to see if that helps.

Gimbal bearing donít make a grinding noise, more like a moan.
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Old 06-27-2018, 10:40 PM   #9
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Will look into the steering cable. Maybe you could call it a moan but definitely not normal.
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Old 06-28-2018, 07:59 AM   #10
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Quote:
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Will look into the steering cable. Maybe you could call it a moan but definitely not normal.
I would tested on land with garden hose and try the gearing and maybe you see anything
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