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  1. Scott06

    4.3 GL tune up spec questions

    Long time Mercruiser owner/shade tree mechanic, helping a close friend with his 2002 Glaston 185 that has a 4.3GL & SX sterndrive. Boat appears to have classic symptoms of needing carb rebuild - rough idle and stumble of transition, some surging when on plane. Fuel filter clean, he went through...
  2. Scott06

    ECM repairs?

    Don't know the guy north of the border but not sure if you tried these guys https://obd2allinone.com/mefiecms.asp#volvo or https://www.boatunlimited.com/marine-ecm-testing-and-repair/
  3. Scott06

    Mercruiser trim confusion - pur/wh trailer switch wire same as limit pur/wh bullet - why?

    https://forums.iboats.com/threads/trim-sender-limit-mercruiser.767372/ in this thread there is a diagram you can see how the trailer switch bypasses the trim limit switch before getting to the trim up solenoid
  4. Scott06

    Mercruiser 3.0 LX wont start after turning engine off. Video

    Probably not the starter but more likely the battery and condition of the cables both positive and negative. So it cranks slow unless you leave a plug out?
  5. Scott06

    Are cheap carburetors good?

    Mercarb if it is original. There is a common lineage from the old school Rochester 2 jet =>Mercarb=> TKS carbs. The 2 jet unless really old will have an electric choke and two idle mixture screws on the base plate. the mercarb which came out in the late 80's or 1990 ish has an electric...
  6. Scott06

    Are cheap carburetors good?

    The only items I think it makes sense to buy a new carb is like mowers and weed wackers etc. Go to mikes carb parts and spend $50-60 on a quality rebuild kit. Especially if you can do the work yourself you will be money ahead. ....
  7. Scott06

    ‘87 3.0l into my 2006 Tahoe with gen. 2 equipment

    I think maybe head and manifold as well. not sure exactly when that cut over is but there are two listings for heads and manifolds. If you have a complete bobtail like Bondo said I don't think it matters. If you were swapping long blocks might be a different story
  8. Scott06

    Time to upgrade. Looking at 5.0 MPI w Bravo 3

    First read up on bravo corrosion issues. very common on B3 drives for corrosion to require gear case replacement. If he hit a rock it such that it no longer has forward gear likely you are looking at a complete tear down and inspection. yes you can do a compression test that way but really...
  9. Scott06

    ‘87 3.0l into my 2006 Tahoe with gen. 2 equipment

    As long as the driveshaft from the gen two inserts the same distance as the coupler on olde engine it will work. I think it should but since you have both engine sin front of you measure the coupler distance to the rear motor mounts i think you will find them the same ? the splines on the two...
  10. Scott06

    Trim Sender/Limit Mercruiser

    The power to trim motor doesn’t go through the 50 amp breaker on the 12 v system ( normally mounted on engine on mercruisers)
  11. Scott06

    Mercruiser 3.0 LX wont start after turning engine off. Video

    if you have compression, fuel, and spark i should cough or run momentarily… especially if u dump a little gas down carb , or starting fluid like u tried. So im thinking spark is too weak to fire it off. get a cheap spark gap tester like this...
  12. Scott06

    Mercruiser 3.0 LX wont start after turning engine off. Video

    Would think you have a weak spark or no compression As a sanity check do a cold compression check to make sure there are no dead cylinders Also check with spark gap tester that you are not loading spark from coil to distributor to plugs You can retime it by putting at tdc on 1 cylinder or...
  13. Scott06

    Mercruiser 3.0 Overheating

    Double check this on the drop down menu for your engine there are two thermostat housing assembly listings split by serial number OLxxx and up is 160 thermostat i have a 160 thermostat and engine runs about 170 per gauge …
  14. Scott06

    Merc 4.3 mechanical fuel pump oil leak

    Yeah i wonder if casting is porous maybe you can clean and slather with permatex #3 or similar to test
  15. Scott06

    Mercruiser 3.0 Overheating

    Put the hose back on or replace with new. This is the water supply hose up from drive. Hook it back up. Make sure water is coming up from outdrive to thermostat housing. Should have 3 qts every 15 seconds or so. would just look for melted rubber components on exhaust(rubber boots and shutters)...
  16. Scott06

    120 HP mercruiser 153 ci 2.5 L issues

    i think you probably have other fish to fry first. a properly set up points system is as good as electronic except it needs annual maintenance in terms of cleaning and setting the dwell.
  17. 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 .
  18. 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...
  19. 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
  20. 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...
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