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  1. tpenfield

    980 hours on engines - compression test

    Thanks, everyone for the additional comments. I think I would pull the heads for a top-end rebuild, but only do the bottom-end if there appeared to be excessive wear. Probably won't start this until next year. I still have an extended swim platform (ESP) to add to the boat. At the same time...
  2. tpenfield

    980 hours on engines - compression test

    Thanks, AD :thumb: After my previous post, I did the math and realized that a 0.030 over bore is not going change things much . . . I guess you need to stroke the engines to really increase Cubic Inches . . . :) I found a web site that does the calculations for the over bore . . . Standard...
  3. tpenfield

    980 hours on engines - compression test

    Scott, Here is the history of compression tests, including the one done during the pre-purchase survey. . . The second one done in 2014 ( '2014C' ) was done same year after a decarb process. IIRC, I used water for the decarb in 2014.
  4. tpenfield

    980 hours on engines - compression test

    I have 980 hours on my twin Mercruiser 7.4 LX MPI engines. They are going to lap 1,000 next season, as I average 40 hours per year, since buying the boat in 2012. . . 2013 being our first season with it on the water. I have not done a compression test in a couple of years, so I wanted to do...
  5. tpenfield

    Moving axles; inches vs % need help

    Here are my calculations . . . EDIT . . . Fixed the arrows on the tongue and axle weights . . .
  6. tpenfield

    Smelly head

    Here is the system diagram from the Chaparral Owner's Manual (available online)
  7. tpenfield

    Custom Fiberglass Extended Swim Platform

    Finished the rough shaping today . . . . I will be filling a few voids and then doing some final shaping.
  8. tpenfield

    Custom Fiberglass Extended Swim Platform

    Progress Update: I got the foam 'plug' roughed out. I used 2" thick EPS sheets, glued together with PL adhesive. Next steps are to . . . Fill a few voids Fillet inside corners Sand to shape Coat with epoxy Apply non-skid material - still trying to figure out the best (and economical)...
  9. tpenfield

    Custom Fiberglass Extended Swim Platform

    I have been doing some searching for non-skid patterns for mold makers. I came across a company . . . Gibco (gibcoflexmold.com) that seems to have the patterns that many boat companies use for their non-skid. They happen to list this pattern for Formula and Fountain boats. It comes in both...
  10. tpenfield

    Custom Fiberglass Extended Swim Platform

    Thanks WoG :) That was the link I had been looking for and could not seem to find. I went out to the boat (on its mooring) and made a bunch of measurements. I figured the platform was going to be about 8 feet wide. Measured out at about 95" to fit on top of the existing platform. Here are the...
  11. tpenfield

    Custom Fiberglass Extended Swim Platform

    BTW - this is what the current standard/built-in platform looks like now . . . Admiral's feet and all :)
  12. tpenfield

    Custom Fiberglass Extended Swim Platform

    It looks like our next boat is still a few years away, so I am thinking about doing some enhancements to the current barge, a Formula 330 Sun Sport. I always wanted an extended swim platform to get the people out beyond the outdrives, as they present a mild hazard when doing the sandbar thing...
  13. tpenfield

    Question regarding wood used in new Sea Ray

    Here is a Sea Ray Factory Tour Video . . . These pics from the video look like a cruiser hull structure and layup . . .
  14. tpenfield

    1994 Four Winns Freedom 170 leaking from outdrive

    Transom assembly . . . Looks 'interesting' in that the leak is coming through a hole in the assembly, just below one of the mounting studs. Some possibilities are: 1) Leaking outer seal on the transom assembly 2) Rotting transom You could drill a couple of small (1/4") test holes into the...
  15. tpenfield

    Mercruiser 7.4LX MPI Throttle Position Sensor (TPS)

    Thanks AD. I got it sorted out. There were 2 set screws. I was able to get the TP down to 1.2% with the set screw and then I was able to loosen the sensor, tweak it and re-tighten it to take out the rest. 0% 0.55Volts Here is the Diacom readout . . . I then buttoned everything up and took...
  16. tpenfield

    Trouble Shooting Guide

    I found it . . .
  17. tpenfield

    How to add fluid to trim tabs

    Here you go . . There is a little cap that comes off just to the side of the motors.
  18. tpenfield

    Mercruiser 7.4LX MPI Throttle Position Sensor (TPS)

    According to my Mercruiser P/N searching, the TPS looks like this . . . I did not see any like images in the links, but maybe I need to look deeper into those web sites. I did see the eBay links. :thumb:
  19. tpenfield

    Mercruiser 7.4LX MPI Throttle Position Sensor (TPS)

    I got a TPS error code ( I think it was code 24) on my starboard engine (as I mentioned in my ECT Thread). I also got a MAP error code (I think it was code 33) I didn't write the codes down before I cleared them. Anyway, I am seeing occasional high idle and surging from the starboard engine...
  20. tpenfield

    Wood construction

    Here is some brochure info from the 1980's (I think)
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