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  1. Scott06

    120 HP mercruiser 153 ci 2.5 L issues

    They all run great in the driveway with no load on them. Would try the remote tank and likely a fuel contamination issue .
  2. Scott06

    Strange sound that disappears after a few minuets.

    The hissing noise is the TKS valve in the carb. It should hiss on cold starts until engine gets up to speed. the tks system uses a enrichment valve to fatten up cold start mixture vs a conventional choke. The whole idea is a work around so folks who have never driven a carburated car dont have...
  3. Scott06

    Water in oil

    Yes it is a diesel oil but is fine for gas use. When I repowered in 2016 it is what Michigan motorz required for warranty
  4. Scott06

    Choosing first prop to run .

    My swag would be the 11.5” just based off all the the older OBs like that I ran had lower pitch props like 9,10, or 11” I would definitely take the 14” with you and swap out if you are way off. Would be worth getting a tach to see Where you land. I have a wireless tach & kv meter that is great...
  5. Scott06

    4.3 runs great for about 30 minutes then bogs, pops won't accelerate

    That guys awful cocky about the advice after posting about carb timing …. Kind of like giving driving directions to Ray Charles over the phone …
  6. Scott06

    Running hot?

    As AD suggested verify with a IR thermometer Since it is a new to you boat do you have any receipts of when raw water pump impeller was last done ?
  7. Scott06

    Water in Oil (Again) Head Scratcher

    There really shouldn’t be any warpage on the manifold to elbow sealing surface. If you see daylight under a it I would file them or have a machine shops mill them flat. When u pressure test the cooling system be interested to see if u have an intake gasket leak or pinhole under the thermostat
  8. Scott06

    Getting a weird grinding sound in Sterndrive. Merc A1-G1.

    Does it change when you turn drive or change trim position Could also be gimbal bearing or u joints
  9. Scott06

    1998 mercruiser 4.3LH

    Yours will have balance shaft and roller lifters Look at Michigan motorz https://www.michiganmotorz.com/4-3l-vortec-marine-engine-1996-current
  10. Scott06

    Need to check shutters… any tips?

    Use power tune behind the rubber couplings for some slide. I was able to slide mine down the wye pipe and spin the down elbows off without taking the riser elbows off
  11. Scott06

    Stalling and Starting problems

    If lowering the float doesn’t fix it I believe the spring loaded needle and seat was used to combat flooding issue. That and the non spring loaded needle and Seat have two different float levels but might be worth trying an oem quality spring loaded needle and seat. Obviously by changing it out...
  12. Scott06

    Water in oil

    Im sure that will be fine . If you are looking to save a few bucks on oil use Rotella T4 15w40 Conventional. Its fine for marine use and is about as inexpensive as they come
  13. Scott06

    1987 Mercruiser 454 Loud 'Popping Noise'

    Probably a lean sneeze due to running lean . Would look at fuel supply and carb rebuild. What do the spark plugs look like ? Would bet they look lean
  14. Scott06

    Is there a way to tell if the impeller is working?

    Look in the service manual there is a water pump volume test where u take the hose from outdrive and collect the water in a bucket was like 3-4 qts In 15 seconds. This is in the water not on muffs
  15. Scott06

    Camshaft specs. needed, modification feasible?

    It will likely run ok with jetting changes but won’t see performance gains until you add a 4 bbl
  16. Scott06

    Sank the 'ol girl!?!

    Did u run through troubleshooting guide for t bolt here https://forums.iboats.com/threads/how-mercruiser-thunderbolt-ignition-systems-work.676476/ ? If module is bad yes go delco est, but if just sensor in dist replace that
  17. Scott06

    Revolution 4 19 pitch

    Best bet is ebay I put in saved searches for the props I wanted to test, eventually one comes up but for a Rev 4 expect to dig into your pocket a bit. I saw they just tweaked the Rev design under the Mercury Racing moniker as Ventera so maybe used Rev 4 prop prices will drop. It took me a year...
  18. Scott06

    350 Mag Mpi hard to start when warm or hot

    Screen shots attached show how to do a static and running valve lash. if done correctly when you go one turn past zero lash the valve should not be open assuming the cylinder is on rdc on compression stroke. If it opens likely yiu were past zero lash when yiu started the turn
  19. Scott06

    Mercruiser Oil Pan Replacement and Protection

    Have seen others use Bed liner on the oil pans to prevent corrosion
  20. Scott06

    1987 Larson 120 motor removal

    No pull the outdrive first then motor. Pulling outdrive eill take you longer to read the manual of how to then to actually pull the drive
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