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  1. 9

    91 Johnson GT 150 Possibly Seized

    I have the OEM manual coming in the next couple days. I’m waiting on that before I proceed any further. I will update this thread when I know more!
  2. 9

    91 Johnson GT 150 Possibly Seized

    Thank you for getting back to me. Motor is pretty torn down at this point. I have the carbs off as I was going to rebuild anyways. I don’t have an OEM service manual for this motor, but I was able to find a diagram with an exploded view. Is my next step to remove the plate that held all the...
  3. 9

    91 Johnson GT 150 Possibly Seized

    Yes, sorry. I saw the extra gasket material (maybe silicone) that was pretty much dust. One of the head gaskets looks damaged around one of the head bolts. Not too bad though. The picture I took is of the right side. The cylinder I’m suspecting is on the left. Either way, all pistons move...
  4. 9

    91 Johnson GT 150 Possibly Seized

    Also, no thermostats present on either head.
  5. 9

    91 Johnson GT 150 Possibly Seized

    Sorry, forgot to mention the lower unit is off.
  6. 9

    91 Johnson GT 150 Possibly Seized

    Ok guys, another update for you. I pulled both heads, and first thing I noticed was no head gaskets…. Like just an imprint from where they used to be… All the cylinders look and feel fine. No burrs or any gouges. I noticed a bit of play in every piston (I can wiggle slightly). So, I held the...
  7. 9

    91 Johnson GT 150 Possibly Seized

    Ok, so update. I had the cylinders soaking in a penetrating oil and put a breaker bar on the flywheel. I was able to turn the flywheel in reverse! When I turned it forward though, it would get back to the same spot and stop. I could go about 1 full rotation in reverse until it would come to a...
  8. 9

    91 Johnson GT 150 Possibly Seized

    No alarms, so it didn’t overheat. VRO is not bypassed, he was using oil tank on the VRO and says it was operating fine for him 2 years ago. He removed about 60% of old gas. I added a heavy dose of SeaFoam and filled the rest of the tank with premium. I’ve run about 2 full tanks through, and...
  9. 9

    91 Johnson GT 150 Possibly Seized

    Thank you for the response. If VRO failed, then it was very recently. Had the air box cover off between last 2 outings and had 2 stroke oil each time (I made sure to clean each trip to make sure). I am removing the leg tonight and will check. Prop spins freely in neutral. In forward, it will...
  10. 9

    91 Johnson GT 150 Possibly Seized

    Hi all, new to the forums here, and hoping for some help. I’ve scanned through similar topics, but can’t find someone with the same issue I’m facing. This post will be long winded as I try to give as much detail as possible. I just bought a 1992 Searay 180 with a 1991 Johnson GT150 on the back...
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