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  1. sabastianunf

    Can you weld a hole in lower unit casting pocket?

    I have a mercruiser 12O sterndrive with a pre alpha outdirve. I think some water must have been trapped in the casting pocket and frozen last winter. at the beginning of this year I saw a small bubble with a crack on the lower unit. It eventually started leaking water and got worse. Can this...
  2. sabastianunf

    120 mercruiser - new water pump still overheats

    I've posted here a few times in the past and have always gotten good advice. A big thank you to everyone that has helped me out before. My current problem is my 120 Mercruiser sterndrive keeps overheating. I had a reputable company put a new water pump in the lower unit - old one looked fine...
  3. sabastianunf

    Timming Advance/preignition combustion?

    I have a 2.5L 120 hp 4 cyl mercruiser sterndrive. It starts, idles and launches great. However when running at WOT or High RPM's under heavy load the valves start making a strange noise and loosing some horse power. It can be best described as sounding like a marble spinning around in the...
  4. sabastianunf

    4 blade 4 sale-michigan wheel vortex

    Basically new - used 4 times Michigan Wheel Vortex 4 blade 15" diamater X 16" pitch prop part #992202. It has cupped blades - no nicks or flaws. Just too much pitch for my boat. Could replace a 3 - blade 15X18 prop. Great for water sports and designed for good hole shot. MSRP is $179 -...
  5. sabastianunf

    RMP Range vs performance and engine life

    I was just wondering what affect over reving an 1978 120 hp mercruiser sterndrive by 100-200 rpm over manufacturer reccomendation would have on performance and engine life? I simply want to get the best hole shot possible but don't want to kill the engine by over reving or loose performance by...
  6. sabastianunf

    Cobia Fishing

    I have just moved to Hilton Head Island, Sc. My neighbor said that the cobia should start running soon. I was just wondering if anyone had any info on bait and/or technique for catching cobia out of inlet waterways. Also if anyone know when or at what water temp they get active would be good...
  7. sabastianunf

    new 4 blade-rpm's too low

    Posted before when deciding on a prop - now I have it but I am not turning as many rpm's as I would like to. I was running a 17p 3 blade at 4200 rpms at wot on my 120 merc. sterndrive. I purchased a vortex 4 blade 16p that is cupped. Now I am only hitting 3900 rpm's. Merc reccomends...
  8. sabastianunf

    new heads

    I have a 1978 mercruiser 120 sterndrive. I have been looking into cheap ways to improve my engine performance. I saw a complete head off a mercruiser 140 including rockers and valves but needs to be rebuilt. They say it will fit a 2.5 L or 3.0 L - could that be correct and would this fit on...
  9. sabastianunf

    cupped vs not

    I am currently running a 3 blade 17 pitch non cupped prop and am hitting ideal rpms. Want to swithch to 4 blade for wakeboarding. I am looking at a vortex prop which is cupped. Does the cupping have any effect on rpm's or top speed? rule of thumb is that a 4 blade 16 pitch replaces a 3 blade...
  10. sabastianunf

    weight vs rpm

    is there any rule of thumb as to increasing weight to decrease rpm. I have a 19 foot cuddy cabin running a 120 Hp merc sterndrive. Any experience or input is greatly appriciated.
  11. sabastianunf

    New bellows - still water in gear oil.

    I had a bunch of work done on my merc sterndrive about 1 1/2 years ago at a reputable shop. included new bellows, u-joints, gimble bearing, exhaust manifod and riser. I am still seeing water in my gear oil. With new bellows I am not sure where this water is coming from. Anyone have any Ideas...
  12. sabastianunf

    drain block and manifold after each use?

    I just put a new exhaust manifold, riser and seals in my 120hp sterndrive mercruiser last year. Pretty pricey parts for my wallet. Since then I have flushed the motor and drained the block and manifold after each use. I was wondering if draining all the water out was neccessary and if I should...
  13. sabastianunf

    Am I the Only One?

    I have a 1977 19' Steury cuddy cabin. It is a fiberglass hull and has a 120 Mercruiser I/o. It is in pretty good shape especially for the age. I have owned it for about 5 years and have done a good bit of work on it but mostly overdue maitenance. I know Stuery went out of business in the...
  14. sabastianunf

    Bow roller marking boat

    I've been reading all the threads but can't find a solution to my problem. Hope y'all can help. I have a 1977 19' Stuery Cuddy Cabin on the original tadam axel trailer. Problem is that when I winch it up the bow roller hits too far up on the bow. I have to put alot of power into the winch to...
  15. sabastianunf

    Lubricating U-Joints

    One last question - I want to lubricate my U-Joints. Can I pull the drive unit without dropping my gear oil? Will the U-Joints come out with the drive unit or will I have to remove the bevel or the bell housing?
  16. sabastianunf

    Lubricating U-Joints

    One last question - I want to lubricate my U-Joints. Can I pull the drive unit without dropping my gear oil? Will the U-Joints come out with the drive unit or will I have to remove the bevel or the bell housing?
  17. sabastianunf

    leak in transom plate

    When I trim my lower unit up i see a leak. If i am in the boat looking past the motor to the trasom plate the leak is at the bottom right. does any one know what could be causing this?
  18. sabastianunf

    leak in transom plate

    When I trim my lower unit up i see a leak. If i am in the boat looking past the motor to the trasom plate the leak is at the bottom right. does any one know what could be causing this?
  19. sabastianunf

    slow hole shot behind 120 merc I/O

    I have a lot of good questions about my 4 cyl 120 hp stern drive 18ft cuddy cabin. I say they are good questions because there seem to be alot of people with simmilar problems. So lets get started. Everything runs pretty good after putting a ton of work into this boat. However, a few things...
  20. sabastianunf

    slow hole shot behind 120 merc I/O

    I have a lot of good questions about my 4 cyl 120 hp stern drive 18ft cuddy cabin. I say they are good questions because there seem to be alot of people with simmilar problems. So lets get started. Everything runs pretty good after putting a ton of work into this boat. However, a few things...
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