Search results

  1. FuelishBehavior

    496 Mag HO Slight Idle Surge

    I have the slightest of surges on my port 2002 496 Mag HO. When I hooked it up to my Diacom software, the IAC percentage seemed to be below 40% but the TPS at idle is showing 0.12% and surges to 0.25% and about 0.55V at idle. Could this be the TPS starting to show some signs of wear and...
  2. FuelishBehavior

    2002 496 Mag HO - IAC location

    I have mechanical throttles on my 496 mag ho. Can someone tell me where the IAC is mounted? It does not appear that it is on the throttle body and the air hose appears to run to the back of the engine. Is there actually a diagram somewhere that actually shows locations of the different...
  3. FuelishBehavior

    '02 496 Mag HO Timing

    I'm in the process of ordering the Diacom software for my lap top to help me diagnose a TPS / IAC issue on my port engine. One of the things that I've read is to check the timing (with a timing light) and not the PC/Software. That being said, how do you adjust the timing on these computer...
  4. FuelishBehavior

    1993 7.4L/Bravo 1 Serial # 0F018585

    I'm about to reinstall my 7.4L (now a 496 stroker)back into my boat. I'm changing all of the engine mounts. According to my research, the flywheel housing has the old style mounts utilizing the double wound lock ring. When buying the new mounts, do I go with the new style (deletion of lock...
  5. FuelishBehavior

    1993 Crownline 7.4L/Bravo 1 to 496/Bravo 1 Prop Sizing?

    I'm about to stab my new 496 stroker into my boat. I'm pretty sure that going from 300 hp to 550 hp will require me to prop up. Currently have a 21 pitch that was right on the money for my original 7.4L which redlined at 4600 RPM's. My new 496 stroker should red line around 5600 with the...
  6. FuelishBehavior

    7.4L / Bravo 1 Oil Pan Dipstick

    I am building a Mark IV 454 (496 stroker) engine to replace my 1993 7.4L which is a Gen V. This is the new bbc marine oil pan I bought which indicates a direct replacement for Mercruiser part no. 93477. What dipstick tube/stick do I use for this? The oil pan also has 3/8" NPT ports with plugs...
  7. FuelishBehavior

    Thermostat Housing Replacement - 1993 7.4L/Bravo 1

    Does someone know of a stainless steel replacement for the big bulky thermostat housing part no. 16413A 3? There seems to be a stainless steel equivalent but it doesn't seem to have enough outlets. It seems to be missing two. Is this the right one or is there something else out there that can...
  8. FuelishBehavior

    Motor Mount Holes

    I believe I've asked this before, when changing out engines, I've read you should remove the lag bolted mounts. I am doing this due to the fact that the adjustable mounts are completely rusted out anyways. When putting the mounts back on the stringer however, do you just use longer lag bolts...
  9. FuelishBehavior

    Trim Switch / 1993 7.4L/Bravo 1

    I didn't want to hijack someone else's post but I have a similar problem to a recent post. My trim switch on the throttle will trim down but not up. However the trailer switch still brings the outdrive up. Is it my switch on the handle or is it the limit switch? A detailed test procedure...
  10. FuelishBehavior

    Bravo 1 Prop Change

    Going from a 300 HP 454 engine to a 500-550 hp 496 engine. Currently have a sstl 21P x 14.8" prop. Any ideas on how much I will need to prop up or where to start? Engine max RPM to be around 5600 RPMs. Boat is a '93 Crownline 225 CCR and weighs about 3800 to 4000 lbs. (guessing). Outdrive...
  11. FuelishBehavior

    Gen V to Mark IV Swap - Sea Water Pump Changeover

    I currently have a 1993 Crownline, 225 CCR with a Gen V 7.4L Bravo 1. It has met it's doom. I have a new custom built 550 HP 496 stroker to replace the old girl that utilized a Mark IV block in lieu of the Gen V. With that being said, I want to use the 1988-1991 Mark IV sea water pump WITHOUT...
  12. FuelishBehavior

    1994 Mercruiser 7.4L

    I've noticed that a new exhaust valve from Mercruiser is approximately $65-$90 depending on where you buy them. Are these stock exhaust valves the good Inconel ones or are they just plain Jane high mark-up stainless steel. If they're just stainless steel, will there be any problem just...
  13. FuelishBehavior

    Bravo 1 / 1993 Crownline / 7.4L / 225 CCR

    I currently have a 300 hp 7.4L bravo 1 with a 21P prop. My new 496 stroker engine will be right around 400 hp. Is there a calculation that I can use to guess the new prop size. My rpm range is going to go from a maximum of 4600 to approximately 5500 as well. Boat weight is approximately 4000...
  14. FuelishBehavior

    1993 Crownline / 7.4L Bravo to 8.1L Stroker / Bravo - Motor Mounts

    I am in the process of putting a new 489 stroker in my old Crownline to get a few more years out of it. The existing mounts in the front have a lot of corrosion on them so I am replacing them. What is the normal process, do you refill the existing lag holes with fiberglass or possibly use...
  15. FuelishBehavior

    1993 Crownline 225 CCR 7.4L Bravo 1

    1st Question: I pulled the starboard exhaust elbow off to visually inspect my manifolds for corrosion. They seem to look fine. (chasing an engine temp. heat up at idle) Since the exhaust system looks good, I bought a new gasket to put back between the manifold and the elbow. This gasket has...
  16. FuelishBehavior

    1993 7.4L/Bravo1 Power Steering

    My boat feels like it only has manual steering. I pulled the rack and the cable completely out of the boat along with the tube assembly (came of the actuator when I removed the nut) and really cleaned the tube and lubricated the cable and put back together. Rack and cable seem to work...
  17. FuelishBehavior

    1993 Crownline 225CCR w/7.4L/Bravo 1 (Steering Cable Replacement)

    I have read how to size my steering cable, I'm just not sure which type I would need. Also, can some one direct me to a good set of directions for removing the cable from the the steering wheel and the power steering actuator as well?
  18. FuelishBehavior

    1993 7.4L/Bravo 1 - Fuel/Carburetor

    My engine has the factory Weber 4 bbl. About 2-3 times a season, I have to take the carburetor apart and clean the brass screens below the needle/seat valves for a really fine almost powdery substance that is causing my engine to lose power and bog out. I change the filter regularly but this...
  19. FuelishBehavior

    Outdrive will trim down, will trailer up, but will not trim up.

    My 1993 Crownline with a 7.4L/Bravo 1 will not trim up. However, it will trim down and if you push the trim up switch all the way up to trailer it will go ahead and trim up. Is it my switch in the throttle/shifter assembly or is something else?
  20. FuelishBehavior

    1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again)

    Re: 1993 7.4L/Bravo 1 - Thunderbolt IV Ignition Issues (Again) Ok, I have 12 volts at positive terminal on coil with ignition on. I disconnected the red/white wire from ignition module to ignition sensor and have 11.90 volts on module side of red/white wire. (Note:) When I went to plug...
Top