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drewm3i

1995 Chaparral 2550 SX Refit and Modifications Thread

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8 hours ago, JGuilesBand said:

Congrats Drew! The boat looks great! I can't wait to see it up close!

:D:beer-7687-1:

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5 hours ago, Phillbo said:

Looks fast sitting still..... 

 

I had a 2300SC with a 7.4L and that thing was a rocket ship. When the lake got rough, trim it up and open it up and it would dance on top of the chop. 

Though not a go fast, our 2550 was very fast and responsive on the sea trial. We will see what a good cruising speed is, but I figure we can do 35 mph without breaking a sweat.

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5 hours ago, ColdOne said:

Good looking boat Drew!

Enjoy

Thank you!

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5 hours ago, Dennis A said:

Assuming the original was 4140 and the aftermarket one is 304,  mechanically the materials are similar enough in this application to not be a problem.  Now corrosion wise, I am concerned it is a matter of swapping one problem for another.  The assumed 4140 O.E. shaft corrodes on the seal journal and damages the seal over time.  The concern with the 304 is the potential galvanic corrosion between the shaft and the aluminum gimbal ring, especially when submerged in saltwater.  This joint is already a problem area for B3 drives, adding galvanic corrosion to the mix won't make it any better.  This is only a directional opinion,  i have no data to use to predict life of one over the other.  My suggestion would be if you are using an aftermarket 304 shaft be extra vigilant about keeping the gimbal ring u-bolt properly torqued.

Very good info here. I will keep it in my purview.

 

When you say torque the bolts, do you mean the allen keys or the gimbal ring bolts?

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It's probably similar to the stainless pivot pins on my DP-SMs. They pass through the Gimbal ring and make contact with the aluminum. Same with the mounting studs on the pivot housing. I take them apart every year and grease them and they're no problem. As soon as you neglect them they become a nightmare. 

You strike me as very pro preventative maintenance so I think you'll be fine!

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I am going to install a grease zerk at the steering pin like I did on my 2335 SS. Hopefully that will help long term!

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Hey I forgot to mention now that you have the boat back in the area I can always lend a hand if you need help moving it. It would suck to have to keep renting trucks. 

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Drew! Glad to see you're doing well and on the water. I've been away for a very long time, but checked back in post-Covid and now that I'm back on the water as well. I've had a lot of changes over the last few years, but overall doing well, and glad to be running around in an old boat again.

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1 hour ago, JGuilesBand said:

Hey I forgot to mention now that you have the boat back in the area I can always lend a hand if you need help moving it. It would suck to have to keep renting trucks. 

Awesome, thanks man I appreciate your generous offer!

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45 minutes ago, jmiska said:

Drew! Glad to see you're doing well and on the water. I've been away for a very long time, but checked back in post-Covid and now that I'm back on the water as well. I've had a lot of changes over the last few years, but overall doing well, and glad to be running around in an old boat again.

Good to hear from you Joe!

Still have the sportcraft?

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Joe! Nice to hear from you again.  Hope you're doing well!

Drew, hope you have a great first season with her.

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Started the arduous process of buffing the boat the other day and also took some more pictures!

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19 hours ago, drewm3i said:

Good to hear from you Joe!

Still have the sportcraft?

I do. It was laid up a while for a number of reasons, but I've recently gotten it all sorted out and we've been using it a lot. I've been glad to have it during this down time. You got a really nice looking boat there. I bet it moves pretty well with the big block. What year is it? It looks in very good shape.

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Drew I seen your post in IG. I follow the #chaparral boat looks to be in great shape. 

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5 hours ago, jmiska said:

I do. It was laid up a while for a number of reasons, but I've recently gotten it all sorted out and we've been using it a lot. I've been glad to have it during this down time. You got a really nice looking boat there. I bet it moves pretty well with the big block. What year is it? It looks in very good shape.

1995 2550 SX (last year they made it), like my original Chap ;). Brings back lots of great memories, but in truth is a far superior boat to any power boat we have owned. Loving it so far...maiden voyage either tomorrow or Saturday!

It is a 50 mph boat with the 454, but really gets out of the hole and seems to cruise nicely around 35 mph.

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3 hours ago, Cmitch said:

Drew I seen your post in IG. I follow the #chaparral boat looks to be in great shape. 

It truly is. Very proud to own her! :beer-7687-1:

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9 minutes ago, drewm3i said:

Posted this video that my wife took during the sea trial.

 

 

Wow, by the looks of that video, that boat drives itself.  :D

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11 minutes ago, tomnjo said:

Wow, by the looks of that video, that boat drives itself.  :D

Chap was way ahead of Elon Musk on that one!!! :funny-7327:

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On ‎5‎/‎28‎/‎2020 at 4:58 PM, jmiska said:

I do. It was laid up a while for a number of reasons, but I've recently gotten it all sorted out and we've been using it a lot. I've been glad to have it during this down time. You got a really nice looking boat there. I bet it moves pretty well with the big block. What year is it? It looks in very good shape.

Holy crap!!!  Is this really you!?!?!??!  :clapsmiley:We have a lot of catching up to do, pal.  How's the fishing or have you been doing any lately?

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Well guys, some day I will buy a boat that does not need maintenance...or will I? I guess that is my reward for prefering the classic lines and prices of older boats! :D

 

Unfortunately, I found out the intermittent rattle on the sea trial was not in fact the swim ladder banging around, but rather the engine trying to compress water that had been leaking into the starboard cylinders by way of a blown head gasket.

 

At first I thought it would be a stuck exhaust valve causing the rattle back through the carb which could clearly be heard from the upper end of the motor while accelerating during our first trip out post sea trial. A compression test showing 30 psi in two cylinders on starboard side confirmed a problem beyond exhaust flappers. At this point, I took the top end apart and found a blown head gasket. Both heads are now off and are being rebuilt by a local machinist. 

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Port exhaust manifold 


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Before tear down


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Starboard side (bad side)


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Starboard head


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Starboard side off


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Port side 


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Both heads off


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Starboard exhaust manifold


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Disassembled


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Starboard head


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Starboard head
 

 

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Motor turning over by hand: I think the lower end has been spared.

 

 

 

Before

 

 

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While waiting for the heads to be rebuilt and machined by the machine shop, I took the liberty to do the following:

Enjoy the view at the marina LOL :funny-7327:

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Design and order the new name!


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Fix a few gelcoat dings, inside and out. For example:

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Install a new proper drain plug. Despite having all SS thru-hulls, Chap used a plastic drain plug on our '95. :scratchchin:

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Re-bed the engine mount stringer lag screws with 5200, in addition to bedding all other hardware in the bilge with butyl tape--no rot yet and I plan to keep it that way!


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Installed the grease fittings for the steering pin...hope to make this one last a long time!

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And then I got the refurbished heads back, which looked brand new!

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Continuing on...

 

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A look inside the block water passages


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Starboard side all cleaned up for re-installation (scraped and sanded)


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New Fel-Pro head gasket fitted


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Anyone know what this loose pan under the intake manifold is???


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Starboard head resting on dowel pins


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Starboard piston


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A few superficial dings in the corner of one piston...

 


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Starboard side torqued down and valve train reassembled


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And then for the port side...which I did the same procedure and was following the torquing process when one of the last (brand new by the way) bolts snapped on the final round of torque (75 ft./lbs.)!!! :slap::thththsoapbox2-1:


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