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  1. K

    4.3 engine mounted raw water pump inquiry

    Several posters on the Donzi/Bravo site that were having overheating problems solved them by going through the bottom of the hull. As already said the crank driven pumps will pull more water than the drive pump especially as some crank belt driven pumps are overdriven. While the V8 drive’s water...
  2. K

    Purchasing 2nd Boat: Jet or Stern Drive?

    The test was done around 1973. I would also like to read the article again. Check out the propulsion on the Navy’s Litoral Combat Ships.The ones being built at the Austel ship yard in Mobile has 4 pumps.
  3. K

    Purchasing 2nd Boat: Jet or Stern Drive?

    I was a Berkeley/ Jacuzzi dealer for over 30 years. I have owned and repaired all 4 styles of propulsion. Outboard, inboard, jet and stern drive.Needless to say there are legitimate pros/cons. I have repaired many stern drives from hitting submerged objects causing some to sink. I once had a...
  4. K

    4.3 engine mounted raw water pump inquiry

    Mercruiser recommends keeping the drive impeller when using a crank driven pump and drawing water from the bottom of the hull connecting the drive pump via a “Y“ pipe arrangement. When I bought my Donzi half the blades were missing in the crank driven pump because the crank pump was pulling a...
  5. K

    1989/1990 4.3 distributor

    Prestolite distributors have the point rotor lobe shaft that will rust and will wear out the breaker point rubbing block. The rest of the distributor was in good condition so it was converted to a Petronics kit.
  6. K

    4.3 engine mounted raw water pump inquiry

    As Scott said the water needs to cool the upper gear housing that is getting heated from the exhaust system, the oil in the upper is getting over heated. Volvo AQ drives have a impeller on the propeller shaft that continuously circulates the oil from the lower to the upper to keep the oil cool...
  7. K

    Mercruiser 3.7 (470) wont turn all the way

    The valve and seat probably have a build up of rust. Just get it running and there is a good chance that the valve seat area will clear up. If it does not then the head needs to come off. Was it hard to free up the stuck valve?
  8. K

    Engine cutting out on low revs.

    As Scott posted you need to acquire some basic equipment. Also a tool to adjust the idle mixture made for Quadrajet carburetors. These can be found a most auto stores, the Thexon is my favorite. Lisle#55250 Thexton#54354 KD#2776 Remove the distributor cap and see if you have breaker points and...
  9. K

    Ignition wiring question 72 350

    The wire from the regulator supplies regulated current to the field circuit to excite the alternator as you said. It could be possible that the regulator is internally shorted feeding current to the ignition circuit. Try disconnecting that wire. The Clymer diagram shows a volt meter. At...
  10. K

    Ignition wiring question 72 350

    Contact Crowley Marine @ 303 355 3355. 0383339 should be the engine harness, they are showing 1 in stock.
  11. K

    Ignition wiring question 72 350

    Take a close look at the starter solenoid, the wire on the 3 o’clock terminal is the by pass that feeds the coil with 12 volts when cranking, it could be possible that the battery cable is contacting the small terminal back feeding the ignition. Look closely at the wiring diagram on the far...
  12. K

    Ignition wiring question 72 350

    I can feel your pain. 72 was the last year OMC used the hard plastic harness connectors that were prone to cause bad connections. Even if your ’s is the round rubber style just the age of the wire‘s insulation has to be the root cause, it is probably crumbling if you just touch it. The...
  13. K

    350 Mag / Alpha One / Gen One water transfer tube

    The adhesive should do the job.
  14. K

    oil pan gasket

    Was the bushing for the lower distributor shaft also replaced? It is located just above the oil pump. If it is worn and not replaced it causes the point gap/dwell & timing to not hold steady.
  15. K

    oil pan gasket

    Summit felpro # 17952 shows the gasket if you order the gasket and it does not match what you have they have a good return policy.
  16. K

    350 Mag / Alpha One / Gen One water transfer tube

    The grommet that seals the tube to the housing is actually a shock absorber bushing. You must have a V8 engine that has a 1” water supply hose going to the engine. Leave it in place and be careful when you re connect the engine side hose that the clamp for the hose is centered over the large...
  17. K

    oil pan gasket

    Felpro #17953 available from Summit or from some others if you just google the part #
  18. K

    Mercruiser 3.7 (470) wont turn all the way

    First with the piston down in the cylinder try to raise the umbrella valve seal with a small scribe or screwdriver and spray some penetrating oil over the valve stem. Get a brass flat punch and hold it over the valve stem then tap the punch with a hammer to see if the valve will move. If it...
  19. K

    Harmonic Balancer bolt thread/size for removal.

    It is definitely 3/8” 16 . Try to get a tap that size to clear the threads if you can. If possible get a 1/2” 20 bolt at least 2-3” long to help reinstall the balancer along with some 3/8” and 1/2” flat washers.
  20. K

    Santa brought me Smart Tabs.

    2Xs with AD on removing the Doel tabs. I had a customer who broke one side of the cavitation plate when he went over a large wave.
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