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  1. Simoniz

    help help help overheating Mecrusier

    Interesting that he says that drive hasn't been apart for 7 years, and that he would replace the impeller if it only had 2 or 3 years use on it. I thought impellers were recommended to be changed every 2 years. Despite that, I have had my boat (Bayliner, Mercruiser 3.0l Alpha 1 Gen 2) put in...
  2. Simoniz

    Diesel oil in Merc 3.0l?

    Ive got some 10w40 turbo diesel engine oil left over from when I last had a diesel engined car. Can I use this in my Mercruiser 3.0l petrol engine No OL634881? We know any grease is better than no grease at all 😀 but does the same apply to engine oil?
  3. Simoniz

    3.0l Thermostat questions

    Took my boat out today and managed to run it aground slightly, luckily only at idling speed and the lake bottom is basically mud mixed with a bit of sand. We pushed the boat off the sand bar and I had a look round and there was no damage to prop or skeg, and all the trim and steering seem ok...
  4. Simoniz

    Anything I could do to prevent rusting of internal surfaces?

    Where you say you sprayed WD40 into the No 5 cylinder, I reckon this is too thin to really tell what is going on. Use engine oil so that if it is a ring / bore problem, it has a chance of imporving the seal. With WD40, by the time you have got the compression tester screwed in, most of it will...
  5. Simoniz

    What issues would a leaky riser cause?

    Have you given the cylinder a squirt of oil to see if that brings the 30psi back up to anywhere near the previous 175? I think the piston rings / bore would have to be in a very bad state to give just 30, and would expect its more of a valve problem, maybe sticking, which water ingress into the...
  6. Simoniz

    Mercruiser 3.0 Exhaust ?

    You might also want to put a new clip or cable tie on the gear shift bellows, where the old one has rusted away.
  7. Simoniz

    Gear Oil, change or OK to check?

    Ive not used my boat all that much this year, 10 - 15 hrs or so. Is it really necessary to change the gear oil or is it sufficient to loosen the plugs and let a little drain out to check for water / oil emulsion? (Alpha 1 Gen 2 behind Merc 135hp.) Cant help but think of my car which according...
  8. Simoniz

    Trim solenoid same as starter slave solenoid?

    Hi, my boat (3.0l mercruiser year 2001), had an issue with the slave solenoid a couple of months ago, so I replaced the solenoid with another which I had in my shed. Now the starting problem is back, clicking solenoid, starter only engages intermittently but always OK if I short the two...
  9. Simoniz

    Mercruiser 3.0l starter motor problem.

    Hi All, been a while since I was on here as my boat has been running sweet, but its just gone back into the water after the winter break and now Im having a bit of trouble. At first the battery (which has been off the boat all winter and regularly charged) would hardly turn the engine over, so...
  10. Simoniz

    Alpha 1 Gen 2 Outboard water hose

    So my dealer has the parts I want to refurbish my sterndrive, but the piece of hose which carries cooling water from the bellhousing to the transom is out of stock. Is there anything special about that hose, or can I just get a piece of automotive heater hose cut to the correct length and use...
  11. Simoniz

    Compression test, hot or cold?

    Hi, Before I go mad and pul the head off my Mercruiser 3.0l year 2000, Eng No OL 634881, Im going to do a compression test on it. Ive looked around on here and seen various figures for compressions, but no officlal numbers, so what shopuld they be please, are they measured with engine hot or...
  12. Simoniz

    OK to run boat for a minute without cooling water?

    As described elsewhere, my Bayliner with 3.0l Merc had a slight overheat a couple of weeks ago when the outboard cooling hose failed. Its being craned out of the water on Friday, is there any problem with driving the boat 50' from its mooring to the dock where the crane will be, should take no...
  13. Simoniz

    Time for some maintenance (general waffling)

    So, I look after my boat quite well, but Im aware its probably due for some TLC. Its a 2000 model Baylner 1750 with 3.0l Merc, Alpha 1 Gen 2 drive. Spent its first few years of life in the sea but has been run in freshwater for the past 12 years. All bellows and water hose were replaced about 10...
  14. Simoniz

    Can I mix 25w40 with 15w40?

    Ive got Quicksilver 25w40 mineral oil in my Merc 3.0l motor right now, do you think it would be OK to top up with some 15w40 marine oil which I have (made my Liqui-Moly, by the way)?
  15. Simoniz

    Alpha 1 Gen 2 Oil filling

    My boat is currently out of the water, and I need to refil the outdrive with oil. I only have just over 1 litre of oil at home and where I live, Merc High Perf Gear Oil is quite expensive. Ill be making a trip to the US where I can buy the stuff much cheaper, but not until after the date when...
  16. Simoniz

    Incorrect link in How To Stickies.

    In the section, Adults Only/Mercruiser Information/HowTo/Replacing Merc Alpha Style Impellor, there are 2 links, One entitled MC1 to Alpha 1 up to and including 1990, and Alpha 1 Gen II only 1991 to present. Unfortunately both links lead to the same info, that for the MC1 to Alpha, ie there is...
  17. Simoniz

    Alpha 1 Gen 2 Lower unit removal

    Hi Im trying to separate the lower unit from the upper unit on my Alpha 1 Gen 2 Outdrive, S/N OL 634881 in order to renew the impeller. Ihave removed all 6 bolts and the lower drive has separated from the upper by about 1/4 inch, such that the dowels have disengaged but the lower unit wont come...
  18. Simoniz

    Lesson learned about boats...

    Took my Bayliner 175 out for a run yesterday with a couple of friends. It had been raining all morning but was forecast to clear up in the afternoon so I insisted that the trip was on and that the weather would get better. By the time we got to the boat the rain had stopped and once we got out...
  19. Simoniz

    Bayliner 175 question

    Hi My 2000 model Bayliner 175 has a kind of slot on each side of the inside of the boat where the rear most 2 seats are. The slots are about 3/4inch high and 10 inches long about 4 inches below the sides of the boat and have a plastic surround. What are they for? My best guess was that it was...
  20. Simoniz

    Humminbird Piranha Max 10 fault

    My Humminbird Piranha Max 10 depth gauge / fish finder has suddenly stopped working. Theres power to the unit and pressing the on button makes a beep but the screen stays blank. Is there anything I can do?
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