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  1. BB63QM

    Power Trim (70s Model 1)

    I am converting from manual trim assist to power trim. I have managed to find all the OEM parts (pistons, brackets, hoses, pump, 3-button, wire run, limit switch, etc), but am lacking a diagram or better yet, a set of pictures, that shows how the wiring hooks up. Specifically and for instance...
  2. BB63QM

    First Successful Outing On The Lake

    My project boat went live this weekend (Glaspar 150 Cutlass with mid-70’s Mercury 850 Thunderbolt) Problems: 1. Could not find reverse. Back on land, discovered that the shift cable was coming up short, so spun the adjustment once and now shifts fine (manually, on land) 2. Shifting hard to...
  3. BB63QM

    Throttle Cable Stretched??

    75 Mercury 850 Symptom A: throttle was not returning to idle (distributor not resting on Idle Stop at idle and if side throttle engaged, RPM went up but then not down when returned flat. Symptom B: the unthreaded brass section of the throttle cable is more than that of the shift cable...
  4. BB63QM

    Power Tilt Conversion

    I have a 1976 Mercury 850 with manual lift assist tilt. I want to switch to hydraulic tilt/trim. According to the manual, there is a bolt on system (which replaced the port/stbd assist pistons with hydraulic pistons, and adds a pump and reservoir and hoses). Questions: 1. Does anyone know the...
  5. BB63QM

    Stator Wires sheared

    My Merc 850 (70’s) had a wire shear off at the stator and the other stator wire or nearly off and old. The wires come from the rectifier and disappear into a grommet buried in black stuff at the alternator stator under the flywheel. The new stator wires (yellow with stripe) from the...
  6. BB63QM

    Remove Driveshaft Housing without Lifting Powerhead?

    I think the answer is NO, but I thought I'd ask. if i undid the 8 nuts holding the housing to the powerhead (or vice versa), can the house fall away and the power hear stay up, or is the housing all that is holding the powerhead up? Just trying to avoid hoisting the powerhead (don't have a...
  7. BB63QM

    Puzzled about Shifting

    Bought a boat with a 90% spun prop…chased issue around mercontrol, shift cables and lower unit with several failed trips to the lake, only to finally hit 100% spun Easy FIS: new prop Now: prior to raising lower unit, I have a good FWD,Neutral, Reverse and Reverse-lock cam alignment. Once...
  8. BB63QM

    70’s Mercury 850 Thunderbolt - Distributor Wires

    I have an 850…works fine (although the rpm’s are a bit high), but I am concerned about the 3 wires from the distributor to the Switch Box Assembly. The wires are worn at the point where they enter the Distributor Body. I soldered one that was sheared off flush and supported others to prevent...
  9. BB63QM

    LU 1655-7332 Parts Diagram?

    Does anyone have a parts diagram for lower unit number 1655-7332, which is on my 1973 850 Thunderbolt? Spec’s part is 1655-7333, so perhaps mine was made with leftover parts or got a replacement in the last 50 years. Anyway, time to replace the gears, so need part numbers (I ordered for the...
  10. BB63QM

    Prop Locking Question (Reverse Locking Cam?)

    I'm new, so bear with me. 1973 Thunderbolt 850; just purchased and rebuilt carbs and in boat electrical. She starts, but only on ether (suspect is weak spark due to old plug wires---solid copper replacements on order), but the prop does not seem to free up in Neutral as i would expect...its not...
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