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  1. Scott06

    1976 Mercruiser 165 Engine Tick & Low Oil Pressure

    To OP what ever oil you use make sure it has enough zinc/ZDDP for flat tappet cams most modern oils do not... I think rotella 15-W40 has enough with out getting into the hot rod type oil$
  2. Scott06

    1976 Mercruiser 165 Engine Tick & Low Oil Pressure

    Agree with bondo at that age and these were not the quietest engines new i wouldn’t go looking for too much trouble. I assume given age and the fact its still in one piece it didn’t get much use ? if you are really dying to get into it or it gets worse would think it would be one of the...
  3. Scott06

    A1G2 decisions. Rebuild or replace?

    Ive never used it always made my own drivers out of material i already had to hit outer race. would ask the OP here that as it seems that is how he damaged his coupler splines
  4. Scott06

    Mercruiser 3.0 diagnosis / serial number decode

    Dump some gas down the carb if it fires it’s the carb , send it back get your money back. If properly rebuilt it should run ok out of box If it doesn’t run u have fuel delivery or spark issue If you are open to it send your old carb to mikes carbs and have home rebuild it
  5. Scott06

    A1G2 decisions. Rebuild or replace?

    I have used a 1” wooden dowel around the outer race and also a 3” pvc sch 40 pipe piece works ok at least u didn’t need to jank the engine
  6. Scott06

    Head Compatibility

    This listing shows one head for the 120 from ‘63-’89 so i suspect only one head was used the entire run of the 120 https://www.michiganmotorz.com/quicksilver-2-5l-cylinder-head-1963-1989 i think the early serial numbers like you are looking for are pre 1982 and most places dont have listings...
  7. Scott06

    1988 Larson trouble with bow up

    Probably trim limit switch is bad, you can jumper it out just need to be careful not to trim up too high. Long term replace the switch but this is best done when doing bellows and you have transom apart
  8. Scott06

    A1G2 decisions. Rebuild or replace?

    If you have the style of gimbal bearing install tool that uses the alignment tool with a hole in it to hold a disc pushing the gimbal you may have been pounding on the splines. metal piece dont thing it is ring gear or starter gear tooth ?..
  9. Scott06

    Plugs fouling

    No the idle circut is for idle Through about 1800 rpm. Primary and secondary are for when throttle is open primaries open first then as you continue on to full throttle secondaries open. Do your self a big favor and get the technical manual for this carb read up on how it works. Or buy a holley...
  10. Scott06

    Plugs fouling

    Not uncommon at all, its typical primaries and secondaries have different jetting.
  11. Scott06

    Merc boggs down at 2,300 rpm’s when in gear.

    Could be several things quality of fuel supply- empty contents if fuel filter into clear jar should be fresh clean gas low fuel pressure measure fuel pressure at that rpm should have 4-6 psi is the ignition system in good shape timing properly set and is full advance happening carb could need...
  12. Scott06

    Stumped. No spark.

    cant say this enough in this thread…Use the troubleshooting guide it is a functional test of the complete TB system https://forums.iboats.com/threads/how-mercruiser-thunderbolt-ignition-systems-work.676476/ the chart in there will guide you through identifying what isnt working
  13. Scott06

    Stumped. No spark.

    Merc puts them on with loctite its just pushed on, so most of the time you have to destroy it to get it off… i used a chisel the last time.
  14. Scott06

    Motor guits 2000 Searay, 350 merc

    Restriction up stream either clogged screen (some are inside pick up tube), leak in connections so you are sucking in air, anti siphon valve is clogged, collapsed fuel line, maybe a clogged fuel tank vent line but would think that would not happen while idling
  15. Scott06

    275 Verado not going into gear Broken drive shaft?

    I think if you click the report button on your post you can ask the mod when it asks for a reason why...
  16. Scott06

    275 Verado not going into gear Broken drive shaft?

    You may want to have mods move this to Merc OB section - but yes your thought about the water pump is not turning thus drive shaft is broken is probably correct. As for why you probably have to drop the lower and look at driveshaft to see
  17. Scott06

    port side exhaust elbow over heating.

    I used universal fit heater hose for my thermostat to riser hoses vs preformed ones, so no issue as long as you can make it fit and get the right diameter
  18. Scott06

    Upper shift shaft washer

    Is the one on the left metal ? It is a plastic washer. You can easily figure this out by assembling it. There is very little room between lever and bellhousing because the pin sits on the shaft in a fixed location. when it is all together if the washer is too thick it will bind up and the shaft...
  19. Scott06

    Stumped. No spark.

    If you haven't go through the troubleshooting guide in stickies to verify it is the sensor. To replace remove cap and rotor to access the sensor
  20. Scott06

    Making sure I purchased the correct coil for a 1996 5.7L

    Read your plugs to make sure it is not running lean
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