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    Best way to test exhaust manifold?

    Thanks for the feedback. I will use the acetone setup. I will double check the corrosion. No disrespect, but I live in Belgium and spare parts for this engine here are almost “zero”. So have to test and try to use maximum what I have.
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    Best way to test exhaust manifold?

    Hi, Mercruiser 165, 70's 6cyl in-line I want to double check if my exhaust manifold has any crack's inside. On the forum I have seen different approaches. 1. Use the acetone method to see if the level drops (both for intake an exhaust I suppose) 2. Use compressed air (not sure to what PSI it...
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    Mercruiser 165 6cyl inline dies when boat is in the water

    Hi, Must be a misunderstanding. The mechanical pump doesn’t work. So I installed an electric one. The issue of the engine happens with the electric pump. But only when boat is in the water
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    Timing mod: running or not running engine

    Ok, seems logic, but wanted to be sure
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    Mercruiser 165 6cyl inline dies when boat is in the water

    Update: Full exhaust circuit is checked, no blockage found (flapper must have been removed while ago). So this is OK. While I am waiting for the upper oil seal (stern drive-yoke) to arrive I double checked the carb again. As I am not using the choke at all, here we only boat in summer time, I...
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    Timing mod: running or not running engine

    Hi, will double check my timing on my mercruiser 165HP 70's. Before I always stopped the engine, loosen the bolt and changed the position of the Delco. Fix the bolt. I was wondering: if I slightly loosen the bolt so I can turn it with some resistance, could I then leave the engine running...
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    Main Jet size for carb 7043183?

    I did some deeper check on Mike's carb and I found this listing for Jets on Rochester 2GC carbs. With some help of chatgpt and providing the full list of all models / engines, this one seems to be very close to my Mercruiser 165: CHEVROLET TRUCK 6 SPL A/T → 7020140 (2GC, .044) Seems to be a...
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    Main Jet size for carb 7043183?

    Mine are similar to this JET. So that would fit I guess. Just weird there is no info on what size the originals are.
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    Main Jet size for carb 7043183?

    Currently I have 2 jets of 0.049 inch. But without finding more details, the info I can find is that this is probably too low.
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    Main Jet size for carb 7043183?

    Hi, I have been reading the service manual quite in detail and states that for my setup: Mercruiser 165HP 6cyl 70's it should have the carb 7043183. Engine serial nr is 4506302. But I would like to verify if the current installed 2 main jets have the correct size. In the service manual I dont...
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    A-Mercruiser I-Drive Unit: pre-load required?

    Thanks! This confirms what I expected. Certailly when I inspected the original washer there was also not marking of "NUT" on it. (but you never know who messed things up before) So, clear now. Thanks for the feedback.
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    A-Mercruiser I-Drive Unit: pre-load required?

    Hi, Serial nr engine: 4506302. The 165HP 6cyl in-line. Based on the service manual and checking the upper unit of the stern-drive I have the "A-Mercruiser I-Drive Unit", some call it MC1 I think (the unit with the pin on the top of vertical shaft) it has no Pre-load. I need to replace the main...
  13. Y

    Mercruiser 165 6cyl inline dies when boat is in the water

    OK, sorry, will use the same thread. Wanted to avoid making it too long
  14. Y

    Mercruiser 165 6cyl inline dies when boat is in the water

    Not yet, is next on my to do. But im 95% sure its clear. Will double check. Really struggling to understand the problem….
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    Mercruiser 165 6cyl inline dies when boat is in the water

    Hi, No luck.... :-( Once boat is just in the water, not even putting it in gear, it dies... Thanks for the advice that was given for this issue. 1. Checked wiring => all OK 2. Installed new points 3. Set gap both on 0.16 (ref manual) but also tried 0.20 4. Checked the dwell with my scope and...
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    Ballast Resistor versus 8-9V on positive Coil

    Thanks. Most I found in the manual now. But “engine runs 8-9v” not yet. But it’s clear now that this is during running
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    Ballast Resistor versus 8-9V on positive Coil

    So if the manual specs 1.8ohm, this means about 3.6 amp not running . (12v/(1.5+1.8)) So when engine is not running this will give me about 6V (1.5*3.6amps) And probably while running as battery goes to 13.5v and with the kick-back, probably an average of 8-9v and around 4amps. This could make...
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    Ballast Resistor versus 8-9V on positive Coil

    Oh, great! I went true the Manual but must have missed this one. Thanks again, that’s good input
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    Ballast Resistor versus 8-9V on positive Coil

    Hi, Working on my Mercruiser 165 70's. And still doubting the 8-9V towards pos Coil side. In this forum it was clear that during cranking you put full battery voltage to the coil to start but once running it should be around 8-9V to avoid sparking of the points. Point are completely new with...
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    Mercruiser 165 6cyl inline dies when boat is in the water

    Bought a simple borescope. Hopefully will learn me something more about inside of the cylinders.
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