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  1. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Nothing in the manual about gear ratios.....did as Nordin suggested....one full turn of the drive shaft moved the prop shaft 1/2 turn....so it seems to be a 2:1 gear ratio. Found a rebuilt LU with one year warranty from Franz's marine. B.O.A.T.
  2. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Going out to the shop tomorrow.....will check my service manual too.
  3. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Nordin, Jerry, Force P......thanks for the great responses.
  4. tg3690

    1978 Chrysler 85HP Powerhead Swap

    "If you look for a replacement LU watch out cause there was both 20 in and 25 in LU." Nordin, are you talking about the length of the driveshaft? I haven't dropped the LU yet but plan to do so Wednesday. " I think there was three different ratios 1:73, 1:93 and 2:1." Is the ratio stamped on...
  5. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Thanks Nordin.....good info.
  6. tg3690

    1978 Chrysler 85HP Powerhead Swap

    I'm not sure either.....by just looking at some parts diagrams on marineengine.com......looks like the LU on 85HP 1977-1982 use the same gear case. As well as the 105, 115, and 120HP models in the 1978 year model. Am sure there are others that would work. May try to have my LU repaired...
  7. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Thanks.....appreciate the thought. Am in no hurry now that winter is here and the holidays are coming up. Do you know what year models would be compatible for LU swap? It is a one piece with single exhaust.
  8. tg3690

    1978 Chrysler 85HP Powerhead Swap

    This LU has never been torn apart....original owner....just regular fluid changes. I wish it was just a residue, but unfortunately this thing was making some serious metal. And the way it was acting on the lake, think I was lucky to make it back to the ramp.
  9. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Update......just about finished with the break-in on this rebuilt PH, ran it for 4 hours yesterday. Was running real good, then during the last 30 minutes it sounded different, like it was struggling to maintain rpm, and noticed a vibration. My first thought was the lower unit. Raised the...
  10. tg3690

    Motor stalls in neutral

    And no maintenance free batteries, AGM, or dry cell batteries....according to CDI Electronics. FYI
  11. tg3690

    1978 Chrysler 85HP Powerhead Swap

  12. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Mr. jerry you are correct.....it's not an '86.....it's a 1988 Force powerhead.....the pic couldn't be clearer.....thanks.
  13. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Thanks.....will take a look in a couple days.
  14. tg3690

    1978 Chrysler 85HP Powerhead Swap

    "Look on the block under the ignition panel" Are you talking about behind the CD box or distributor? Will be back at the shop on Wednesday and will have a look. The Force Blue paint doesn't look new......doubt if Franz painted it, but maybe somebody else did at some point. IF?? he did build...
  15. tg3690

    1978 Chrysler 85HP Powerhead Swap

    I did it clean and dry. (y)
  16. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Thought he said it was an '86....maybe I misunderstood what he said. Will try to find those foundry stamps and find out what it is. Going by the parts diagrams on marineengine.com it shows the newer style thermoswitch started in 1986....which it has.....so I may be off by a few years. It's...
  17. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Thanks Nordin.....This rebuilt PH I got from Franz is actually from a 1986 Force(dark blue). All cylinders bored .020 with Wiseco pistons. He put a different bearing cage on it for the distributor belt and drilled/tapped for the distributor mounting bolts. With the blue body and lots of...
  18. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Did compression/spark tests today.....150 across the board and good spark on all three. Had some minor fuel leaks at the carbs....snugged up the mounting nuts and fuel bowl bolts.....another 30 min run on the muffs and it seems fine now. Next run will be on the lake. Do you typically see...
  19. tg3690

    1978 Chrysler 85HP Powerhead Swap

    Didn't put any oil on it but cleaned it up real good.....thanks.
  20. tg3690

    1978 Chrysler 85HP Powerhead Swap

    I did the lapping racer.....since I was putting my old flywheel onto a rebuilt PH, just to be sure it fit right. After running for an hour, think I will check the torque on FW nut too.
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