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  1. J

    1978 Chrysler 160hp Outboard info/impeller repl.

    Hi Gang I’m a frequent contributor/beneficiary on the Crusader, Volvo and Merc. sites. I could use some help. A friend just purchased a boat with a 1978 Chrysler 160 hp outboard and would like for me to repl. the impeller. I’m not afraid of this task but I can’t seem to find any info on this...
  2. J

    2004 8.1 Gi Flushing attachment on motor

    Hi Guys I’m wondering if the factory flush adaptor by the heat exchanger with the blue cap on it can also be used to run the motor without muffs. The boats is a 2004 with 8.1s and is out of the water. I don’t have the owners manuals. Thanks Jon Allen
  3. J

    Volvo Penta outdrive rebuilder in Mass. area

    Hi Gang Does anyone here know of a reputable outfit than can handle the diagnosis, service and rebuilding of a late 90s SX-DP drive? It seems that fewer and fewer shops are willing to work on V/Ps in and around Mass. Thanks Jon Allen
  4. J

    Setting Cam Angle Retard with Rinda Techmate

    Hi I have twin 2016 Merc 377 Mag ECT motors and would like to check / set the cam angle retard on both motors. My Rinda Techmate displays the info. I am looking for the the correct spec. as interpreted by the Rinda Tech Mate. Also, at what rpm is the cam angle retard best checked at...
  5. J

    2014 Mercruiser 377 MAG Spark Plug Gap

    Hi All. I have twin 2014 377 Mag motors with cat. converters. The decal on the flame arrestor cover states that the proper spark plug is an AC 41-101 The decal states a gap of .040 in. This seems odd to me as most 377 motors using 41-101 plugs with a flat cap HVS distributor are generally...
  6. J

    V/P 350 Late 80s Cooling System Issue

    Hi Gang I have a tough one here. I know I have come to the right place. Engine is a reman 350 Gm. The block is cooled with anti freeze and the exhaust with seawater. It has new exhaust manifolds and elbows, a new 140f thermostat (I know it should be a 160f) It has a new Johnson FS-6 crank...
  7. J

    Q-jet choke pull off

    Hi Guys I was rebuilding a couple of Marine Q jets recently and noticed that the choke plates don’t have a pull off. The device which appears to be a pull off, I believe it is called a vacuum break is linked to the secondary air doors. So my question is: Do these marine Q jets use a choke...
  8. J

    V/P 5.0 carbed motor electro fuel pump hot

    Hi Guys I have a V/p 5.0 GL motor which is carbed with a factory electric pump. Boat runs strong with no issues and will top out at 4400 rpm. The electric fuel pump (Single pump set up with no cell) is noisier than usual and is too hot to touch while running. The filters are new. Anti...
  9. J

    Heat Exchanger inlet vs outlet temps

    Hi Guys Just curious as to what temp reduction percentage one might see on a healthy heat exchanger inlet vs outlet on the closed side at idle and under load. Half systems and Full systems. Thanks Jon Allen
  10. J

    Dpe drive PDS removal from jackshaft style transom plate

    Hi Guys I would like to remove/replace the one piece PDS bearing on a Dpe drive which utilizes a jackshaft. I don’t have a manual that outlines this procedure. I have done this several times in the past on conventional stern drive set ups with the one piece bearing, but the jackshaft set up...
  11. J

    Adjusting an Alpha1 short shift cable in the water

    Hi All Wondering if it’s possible to adj. the short shift cable with the boat in the water. Pulling this boat out without a trailer is difficult and expensive. So if the the short cable is disconnected at the plate and I manually shift it into fwd with the engine idling and maintain pressure...
  12. J

    3.0 Alpha 1 Gen 2 rpms increase prior to gear engagement

    Hi All I have 2005 3.0 Alpha 1 gen 2 equipped boat that I took on for some repair work. When I shift it into fwd or rev. the rpms come up a bit approx 400 rpm before the gears engage. Basically the throttle is opening prior to shifting. It grinds going into reverse. Base idle is OK and...
  13. J

    GM Hydraulic lifter preload adjustment question

    Hi All I have seen different procedures listed for GM hydraulic lifter preload adjustment on this forum. I tend to go with the 8 stop method. My question: Is the two stop method recommended in most GM service manuals subpar in some way? Two stops are far easier than 8 Thanks Misfit
  14. J

    V/p TBI ECM compatible with Mercruiser wiring harness?

    Hi Guys I am faced with a bit of a dilemma. The engine wiring harness on my 1996 5.7 Gi TBI is losing its insulation faster than I'm losing my hair. The correct V/p harness as well as the 4.3 harness which can be used with slight mods are NLA. What I am wondering is if a Mercruiser harness...
  15. J

    Un-Related Submarine Diesel Engine Question

    Hi Guys I have a question which is not related to this forum. There are some very, very knowledgeable people who contribute to this forum who likely have the answer. Question: When viewing old movies and footage of diesel subs at sea, the motors have the valvetrain exposed (no valve...
  16. J

    Piston Choice for a 383 Stroker

    Hi Guys I have a couple of questions regarding choosing a piston for a 383 Stroker build using the 5.7 inch rods. In a 24’ single engine deep v with a 1.95 drive ratio duo prop using 89 octane fuel what would be a reasonable compression ratio to target? The true Vortec piston uses thinner...
  17. J

    Automotive or Marine Coolant Circ. Pump?

    Hi Guys On a std. rotation Gm V8 with a closed cooling system would a standard rotation automotive coolant circulation pump provide more efficient cooling over a marine style pump with a bi directional impeller? Just curious Thanks Jon Allen
  18. J

    383 Stroker Build Questions

    Hi All I have a 1996 non vortec 350 TBI motor which needs replacement. This motor has a one piece rear main seal crank. The drive is a VP DP C1 My plan is to rebuild a 1988 350 SBC using a 383 stroker kit wth D dish pistons and Vortec heads. I have questions: Is a cast 383 kit...
  19. J

    Mercruiser/Wellcraft Exhaust Manifold Access Question

    Hi Gang Its been a while. I have a potential customer who would like his exhaust manifolds and elbows replaced. They are RWC and long overdue. The boat is a 93 Wellcraft Coastal 2800 with twin 5.7 Mercs inboards and there is about a 1/2 inch clearance between the outboard exhaust manifolds...
  20. J

    Wiring diagnosis question

    Hi Guys I could use some help regarding a low TPS output signal. The output V is less than 1.2v at WOT. With the harness disconnected at the TPS the ref. V is 5 v which is good. With harness disconnected and the ignition off I have 1.2 ohms at the TPS ground wire on the harness side which...
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