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  1. nola mike

    Mercruiser 470 raw water in oil

    No, you can have a hg failure that doesn't affect the coolant jacket, or the failure won't show up at 15 psi.
  2. nola mike

    Lost all my oil...again

    Ok, I was able to eliminate the 45' and use original nipple, and then a tee on top. That should eliminate a lot of the leverage on the fitting. Also put the switch directly above, so again, less weight against the straight section. Straight section is also now 1.5" v. 2". Lastly, that brass...
  3. nola mike

    Forum update

    Damn, I was hoping to be the first new post!
  4. 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...
  5. nola mike

    Running lean after engine swap

    I was planning on swapping in the stock rods on the water, but didn't have the torx bits in toolbox #3 🙄 So used the .065x047 rods as before. I pulled plugs after 12 miles of running mostly at 35 mph. My tach is off (going to leave details in my swap thread) so not sure of rpms but it ran great...
  6. 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)...
  7. 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...
  8. nola mike

    Nola Mike's 3.7/470 --> 4.3L swap thread

    Alright! Splashed! About 5-10 miles of driving. , Alternator still funny. Initially wasn't charging, then started overcharging, then settled in. Stayed where it was supposed to rest of the time. Temp was rock solid at 140-150 on my gauge the whole time, except when I did my plug chop and saw...
  9. 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?
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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.
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. nola mike

    Nola Mike's 3.7/470 --> 4.3L swap thread

    Finally got a chance to get back to the motor. Got the rockers/pushrods in, valve covers, a few brackets and accessories, put in a thermostat (that spacer was fun to remove), coupler on. Starting to look like something that might actually run at some point. Only issue was the flywheel cover. I...
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