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  1. nola mike

    4.3L intake manifold drain?

    I've seen discussion about an intake manifold drain that needs to be pulled to winterize the 4.3L vortec. I don't see a super obvious drain plug on mine, and can't find anything in the manual about it. Could someone point me in the right direction? Pic is of my intake manifold, the only thing...
  2. nola mike

    Lost all my oil...again

    Went about 25 miles today. Last mile or so, I noticed that the oil pressure was hovering/bouncing a bit at 50 psi (usually it's 60 at the speed I was going). I was keeping an eye on it, and then it dropped to zero while doing 3k-ish rpm. I immediately (?) shut down. Unlike last time, the carb...
  3. nola mike

    Water in outdrive, pressure tests OK?

    Went about 40-50 miles last weekend for the first trip of the year, and the boat sat on a mooring for 4 days. Pulled the plug after I hauled it out, and had milky gear oil. A1G1 outdrive. I had pressure tested the drive prior to putting it on (both halves independently, and then when assembled)...
  4. nola mike

    Running lean after engine swap

    Finally splashed my 3.7L --> 4.3L swap today. A few issues remain, but the biggest is that I'm running lean. Seems to run fine up until about 2500 RPM, but starts surging after that and eventually starts backfiring if I push it. Doesn't matter if I ramp up slow or fast. Interestingly, it gets on...
  5. nola mike

    Y pipe exhaust boot direction?

    Just realized that the lower exhaust boot connecting the elbow to the y pipe has a slight bend in it that I didn't notice on install. I can't figure out which way it's supposed to bend. Any thoughts?
  6. nola mike

    Lateral alignment?

    Trying to get the new engine up and running. 4.3L replacing a 3.7. New front mounts glassed in. Gimbal bearing replaced. Transom shield/bellhousing cover are from the old engine. Coupler from the donor. When I try to align, It's a bit difficult to get the alignment bar in and out, but not...
  7. nola mike

    Y pipe doesn't fit...

    Still waiting to get to the easy part of this swap... Went to bolt on the y pipe today, and found that only 3 of the 4 bolt holes lined up. The upper left holes don't align. I thought I remembered seeing a 3 v 4 bolt design either in a manual or parts diagram, but don't see it now. The donor y...
  8. nola mike

    Power steering help?

    I've hooked up the power steering running the engine in the driveway. yesterday, I could get the ram to retract, and then it would extend on its own. I found the procedure to balance it, and have it so that the ram now stays in a neutral position. However, regardless of which way I hold the...
  9. nola mike

    Mount lag bolt size?

    The bolts for the front mounts on both my 3.7 and the donor non-balance shaft squish mount 4.3L are 1/2". They won't fit the hole on the newer style solid mounts that I put on the new(er) 4.3L. It looks like the holes are 7/16". I can't find 7/16" lag bolts anywhere. Trying to get something...
  10. nola mike

    Wiring help needed 4.3L TB-IV

    getting close to firing up my 4.3l. I thought I had everything I needed to start out of the boat (wiring harness and gauges from old boat) but don't have the shifter with me. So plan b was to jump the pins on the motor harness. Double checking the pins I got some odd resistance readings. There...
  11. nola mike

    Coil part numbers?

    Anybody have an auto that uses a compatible coil to a 4.3l with TB-IV ignition? Wanting to find something locally, Napa doesn't have theirs in stock, so looking for something that AutoZone or advance, O'Reilly's carries.
  12. nola mike

    Purpose of the 90A starter fuse?

    Doing some rewiring. Noticed that my 4.3L didn't have a starter fuse, so I decided to grab one. Looking over the wiring diagrams however, I'm not really sure of its function. It's unclear to me which wires are connected to the protected side. It appears only the red wire to the slave. If that's...
  13. nola mike

    New electric fuel pump install

    I'm installing an electric fuel pump on my new '01 4.3L block. Getting a bit confused. Plumbing: 1. I know I can use A1 fuel line after the pump to the carb. The pump uses 1/4" NPT fittings on both sides, and the carb uses a 3/8" inverted flare. Hopefully that's something I can get locally. I...
  14. nola mike

    Remote oil filter kit?

    Looking to install a remote oil filter kit on my hopefully-soon-to-be-installed 4.3L. I have no idea how the accessibility will be prior to the engine install, but figure it couldn't hurt. The OEM kits are well over $300. Auto ones are $50ish. I've seen stuff on here about trouble with the auto...
  15. nola mike

    25 hp Merc no start after flooding

    Went to go for a ride yesterday. Started OK, but was running a bit rough until revved, and smoking. Didn't think TOO much of it until it stalled and wouldn't start. Having problems with the switch (sometimes it turns the starter, sometimes not). Tried to pull start it when I realized that the...
  16. nola mike

    Power steering hose replacement?

    Anyone know the fitting sizes for the high pressure power steering hose from the pump to the control valve? I don't have one of the fittings. Pn is 32-90494. Going to try to find an off the shelf replacement, or have one made up. $150 for the OEM part...
  17. nola mike

    Glassing in new motor mounts?

    I'm replacing my 3.7L with a 4.3. Next week's project is going to be to glass in some new motor mounts. I've had some advice on how to measure, what to do, etc, but couldn't find a ton of info. I replaced the floor a few years back, and the stringers are in good shape back there. 1. I don't plan...
  18. nola mike

    Turning motor over, where to put the juice?

    Going to compression test the new 4.3 tomorrow. Got a battery, and a long block with starter attached. I don't recall seeing the slave, but assume that it's still on there (?). What's the best way to do this? I'll probably use jumper cables, since I'm not sure what kind of wiring I have...
  19. nola mike

    Boat fired up on first crank...has this ever happened?

    Threw the skiff in the water last weekend after the weekend. As expected, battery dead. Gas from the end of last year. So go to pull start, and it starts on literally the first pull. 2 stroke engine. This has to be the first time in history this has happened. I was so surprised that I didn't...
  20. nola mike

    How's my transom?

    Just pulled my engine, and am trying to determine if my transom is rotted or if I'm good to go with the engine swap. I drilled a bunch of 1/2" holes, and really can't figure out what I'm looking at. The wood is consistent at every hole (even at the top). The transom feels solid and looks solid...
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