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  1. Rivergator

    Overhauling my 1988 Alpha One Drive Train

    Please forgive me if I have no clue or conception of how the lower cable actually works, since I am totally new to the Alpha One world. Engines are a bit more generic and I am familiar with most aspects of that technology. Also I am pretty engineering savvy and usually have no problem...
  2. Rivergator

    Overhauling my 1988 Alpha One Drive Train

    ............continued from "Overhauling my 1988 Mercruiser 4.3 ltr engine" I am about to start cleaning up and restoring the bilge of my 1988 Sylvan bow rider and going over the transom assembly I started with a thorough clean up of the inside of bellows, bell housing, gimbal housing, inner...
  3. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Well. this thread is coming to a close. The engine is done. I still have to install the pullies, alternator, starter (both on order), power steering pump and carburetor, which I will do in the next couple of days, except for the carburetor which will be installed after engine is back in the boat...
  4. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    The stuck one is the good one actually, nice, shiny and clean but stuck. But no longer a problem. I unstuck it already. So if all fails I will be able to make one good carb out of the 2. The one with the broken spring will be my next experiment or challenge so to speak. I will try to remove the...
  5. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Thanks Kenny and Lou. Looks like all is good! Next thing, the distributor and the thermostat housing go back on. Both have been serviced and are good to go. Btw. those of you who said I should take a closer look inside the carburetor were absolutely correct. What a mess! I am overhauling both...
  6. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    The heads I did some time ago but I used Permatex 2B sealer on the bolts. I hope that was ok. If not, I can do the head bolts over again without having to take anything apart, thank God!
  7. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Thanks Lou. Yes, I cleaned up everything thoroughly, all holes, all threads male and female with my tab and die set, then vacuumed it out and finished it off with a blow of compressed air.
  8. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Nice heads, Lou. I am using the Sierra 18-1275 gasket set. I got it all straight in my head now and I am ready to put the top back on. Just out of curiosity, why not put a thin film of aircraft sealant on the whole gasket instead just the water outlets? Wouldn't that eliminate the possibility of...
  9. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    For the intake, yes the "china wall" front and rear vertical ends of the block get a bead of sealant, like Permatex Ultra Grey and continue it up the cyl head by about 1/2" or so. When I did my intake gaskets I used a bit of OMC gasket sealer on the water passages front and rear, to keep the...
  10. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Scott, Rick and Lou. Thanks for all the good info, that really helped. Yes Rick, I was able to pry all 4 studs out with relative ease and now the new shield is installed and all is good. Lou I took a good look inside the manifold at the thermostat area and it too looks good and solid. I...
  11. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    So removing the whole thing versus rust pieces falling in to the engine is the lesser of the 2 negatives. I can see that. If there are no adverse effects removing the cover I will do that. I will try to pry the studs off and if that works that will be great. I do have a good spare cover to...
  12. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    What is the purpose of the metal cover underneath the intake manifold? As I was getting the manifold ready to install I noticed a few little rust holes in that cover (see circle). Is that cover important or shall I ignore the little rust holes? I have a good spare one that I could replace this...
  13. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Scott, I compared the old carb with the new one and I am happy to say that they are the same and identical. The old carb has a metal tag screwed on one of its bolts which says Mercruiser MCM175 and the number 33049565. the new carb does not have any tag on it but has the same number stamped on...
  14. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Thanks for all that great info. I learned a lot. What I neglected to mention was that the new manifold also included the carburetor (see picture). So I assume since the whole thing came as a set to leave it all alone and install the manifold without the old heating tube. Btw, the original...
  15. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Thanks Rick for the torque specs. My intake manifold was too rotten so I found a good used one on ebay. I received it the other day with a slight difference than my old one though. Right next to the carburetor on starboard on my old manifold is this thing, looks like a probe or sensor (see...
  16. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Thanks Scott for answering my questions. Please confirm that the following torque values are correct. I am getting conflicting values from different manuals and I am not sure what is right. Here is what I did: Head bolts = 70 ft/lbs crankshaft main bearing cap nuts = 65 ft/lbs connecting rod cap...
  17. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    I am about to install the hydro lifters, push rods, rocker arms etc. and I have a lot of questions about the lifters. They have been sitting in the shelf now for several months and I don't know if they are empty, half full or full of oil. I know how to adjust lash and preload, but I don't know...
  18. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    I will stay with standard. I was able to read the grade markings off one of the OEM bolts and they are grade 5. I also noticed that 6 of the bolts are 1 1/4" long and the other 6 are 1 1/8" long. When I took them out I thought they were all the same length except for 4 bolts that were holding...
  19. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    Thanks Rick. So I can use SS as well, if I wanted to!?
  20. Rivergator

    Overhauling my 1988 MerCruiser 4.3 ltr. engine

    I am going to replace the intake manifold bolts, because the heads are rotten and partially stripped. I like to replace them with the same correct washerhead bolts. Can anybody tell me what strength grade these bolts are? Is it a 5 or 8 or ????
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