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  1. rothfm

    Thought I broke a ring, loose flywheel nut...1993 140 Question

    Whewww...Think I dodged a bullet. In water- testing my $250 new to me Unadulterated low hour 140, I had a real scare. Test run went real well. Idle was good, WOT good. Returning to ramp, it began shaking, and really sounded like I broke a ring (been there before on other motors), I shut it...
  2. rothfm

    Question on Head to Manifold mating surface quality on 7.4 454 Mercruiser inboards

    Hi, (I usually work outboards) Ok, no pics but I'm helping someone do a twin 7.4 454 Inboard Manifold/spacer/Elbow, Remove and Replace job. Got the old gear off no problem. Inspected the exhaust valve stems for rusting or signs of water...None apparent. Cleaned up all the head surfaces, and...
  3. rothfm

    7.4 454 Inboards...Unwinterize issue ??

    I bit nervous with something I saw today, when pulling off my brothers twin 7.4 mani's and risers for replacement. I Cant really explain this. These are INBOARDS. Blocks are fresh cooled, with raw in Mani's and Risers( 1/2 system). Removing each manifold, I first took the hose off to drain any...
  4. rothfm

    New to me 1993 140 Looper couple questions from a crossflow guy

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  5. rothfm

    New to me 1993 140 Looper couple questions from a crossflow guy

    I'm a crossflow guy,, I know them really well. Lots of experience. I Picked up this motor for a possible long term project. Old guy kept it in his heated garage for 10yrs. To my surprise, he let it go for 250 bucks! And it looked really clean. Brought it home, its unadulterated and not...
  6. rothfm

    Using threaded rod for manifold removal "tool"

    Going to be working on a family members twin 7.4 454's in a SeaRay Amberjack 34. Doing Mani's, risers among other work. I've read that using a pair of threaded rods as "slides" when removing the manifold is helpful to not drop them etc...I'd like to do this. Does anyone know the size and...
  7. rothfm

    Do port edges really catch rings?

    Pics: Shot of the "ding" first noticed when doing head gaskets..Prompted me to take it apart. Shot showing the portion missing Again, Motor was put together my me 1yr year ago with new rings, pistons and bearings. Still very clean. No carbon at all. Below are a few pics of the...
  8. rothfm

    Do port edges really catch rings?

    Heres why I ask....rebuilt motor last year, myself (not my first). Came out great. Ran it all season. I also decarb and do carb kits and soaks annually on my motors. Was gonna sell this motor (1984 115), and was doing a freshen-up on it first. Low and behold found a small missing piece of...
  9. rothfm

    Crappy base gaskets?

    Just bout several Sierra powerhead base gaskets The are so thin and flimsy im not sure i want to use them. Made of non coated paper material. At least the envelope said sierra anyway, maybe the seller put something else inside Is there a good thick gasket? BRP brand maybe better? I typically...
  10. rothfm

    7.4 Merc Horizon inboards questions on Exhaust Mani/Risers and water ingestion

    Helping out a family member (I'm the outboard type) but do alot of the maint on his boat...He purchased this 1yr ago and got a successfull season out of it so far......1999 Sea Ray 34 Amberjack w/dual 7.4's. These are Coolant cooled blocks, with Raw water to the mani's and Risers...Its time to...
  11. rothfm

    Fuel puddling under powerhead, can nicked Port edge be causing this? Pic

    Hi all, bit of a read, but need to be clear I reworked my 1993 115 last year. Had a piston scuff and break rings..went all through the motor. The cylinder measured good, only had extremely fine lines that I honed out (and remeasured again) and some aluminum transfer that I used acid to remove...
  12. rothfm

    Crankcase sealed then I turned it by hand, am I ok?

    I sealed up a Case as I have done several times...However after it was sealed and torqued to specs...I turned it over a bunch of times with a socket on the flywheel/Crank. While this is actually recommend to check for binds etc..I did it with the plugs in, and reeds/intake installed. Is this...
  13. rothfm

    self-etching Primers? Repainting outboard

    During my rebuild process (finished 2 complete rebuild Johnson v-4 crossflows), As everything was disassembled I painted each piece, including the block, and also applied new cowl decals...... This was a painstaking process. Not so much the cowl or exhaust housing, but the Engine "Pan"...
  14. rothfm

    Can JB Weld be used in this area?

    Removing a 1993 115 Powerhead, I had to re-lower the PH momentarily due to my hoist...It slowly came down onto the end of the shift rod and knocked a small piece out of the front of the crank case...See the hole in the picture. Can I plug this hole? Obviously it not in the higher pressure...
  15. rothfm

    1993 115hp: Can fast beep(machine gun) on non-vro motor

    I'm usually pretty good on this type of topic, but this is a bit odd..... Lots of posts on this extremely fast beep from the horn...However I have no VRO, replaced to pulse port conventional pump last year and been running great. Very dependable motor, takes me to far way adventures! Sunday...
  16. rothfm

    7.4 Horizon inboards surging at Fast idle..Basic questions

    Hi, Trying to help a family member with a new to him boat. 1998 Sea Ray 33 express with twin 7.4 Horizon MC inboards. We have done a lot of research on the topic and understand the interrelationships of AID, Throttle plates, TPS etc....We replaced AIC's for a Sirge/Stall symptom because when...
  17. rothfm

    General spark plug wire routing questioin. Pics

    I have a cowl that seems to always catch my wires (1987 90hp), and the older plug wires were arching and shorting to the latches and back of cowl. So I turned all 4 coils around (primary and secondary pointing toward the crank), I will be getting brand new wires, but I used the old ones to see...
  18. rothfm

    Help locating 1998 Horizon 7.4 Inboard Idle Air Control

    Helping my brother with his Sea Ray with twin 454 Mercruiser Horizon 7.4's SN: L008277....I'm an outboard guy. For the life of me cant seem to find a diagram or definitive location for the IAC. I spent a long time looking over the blocks, and have the PN and a pic of what it looks like. The...
  19. rothfm

    For the Rebuilders: Help ID source of Fuel leak at Lower crank Head. PICS

    Can anyone in the know provide some insight to my mystery: bit of history. I took this PH apart a year ago for a measure, and re-ring. I finally mounted it recently, and been testing the last couple days. Runs great, appx 118lbs on all 4, idles super smooth. But I have the ugly streaks starting...
  20. rothfm

    Can anyone ID this little hole under V-4 powerhead?

    Ive had my 1987 90hp powerhead on/off a couple times for work.... See pic. When on the chain hoist, i noticed raw fuel mix coming from this hole. Never noticed this before. Im gonna guess its a lube hole that goes to the crank somehow, didnt realize that would be raw fuel however. Just...
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