JBOUTLAW25

I may be looking at a boat with 575's and superchillers.
I'm curious about the reliability. Time before rebuilds.
Average cost of rebuild or refresh. Common issues/failures Any input is greatly appreciated.

JaayTeee

I have 200 hrs on mine, the last 50 of
which were since my ownership.

Neither of them uses ANY oil

The only issue I've had was a leaking
front seal on one of the superchargers.

I've heard of a few people having rear bearing
failures on the superchargers, these were the
newer style with the sealed ball bearings.

Steve Zuckerman

A friend of mine and I both have 300 hours, with good reliability. The chillers are a great addition.
What JT says on the superchargers. I change the oil in mine (front and rear reservoirs) every 25 hours. The earlier models with the "W" (Weiand) on the front bearing plate seem to be holding up better than the newer ones ones with the oil level sight glass.
Also keep and eye on the mechanical (attached to the water pump) fuel pump. It has a oil reservoir that is difficult to change, and can get fuel or water contaminated.
Overall, we are very pleased with our 575s.
Steve

25 hors la loi

How fast the 33 go with this engine ???
Just to be curious
Thank`s

Pesky Varmint

I have over 400 hours. I have the old superchargers and did have to rebuild one because a seal went, and have friends with the newer sight glass version who are having less luck with superchargers. The old ones are better. And Steve's
comments on the mechanical pump are right on. Keep on
eye out for any gasoline in the clear vent tube, pull them yearly (this year the little reservoir was full of oil/gas mix so I had to replace the pump). I think this mechanical pre pump is a superb idea, but you have to keep after it.

As far as overhaul I had a long discussion with Larrys engine
and marine in Tucson. Keep in mind that these are 7.5 compression, flat tappet engines with 4.5 lbs of boost, actually pretty mild. Our opinion is that unless they use oil (never use or leak a drop); or compression drops, don't touch them. Although I believe in and should be doing oil analysis but I'm lazy. Also, I'm not a kid, so these motors have seen most of their hours at 4000 rpm cruise and no wake, and maybe 20% at full throttle.

In short, they seem quite reliable.

JaayTeee

I've seen 87 gps.

I'm messing around with props and short lowers,
hoping to hit 90.

JaayTeee

Something else you could have checked.

Have the ECM's scanned, see where the engines
have spent most of there time, rpm wise.

If they've been maintained properly, and most of
the hours are under 3500 rpm, there probably
good for a looong time.

Steve Zuckerman

Pesky and guys,
This pull over mechanical pump issue is a sneaky one. Keep an eye on your fuel pressure. If it begins to fall off at WOT, you've got problems.
I noticed it when my motor began to surge at WOT, and the FP gauge was bouncing.
What we found is that the reservoir becomes fuel and/or water contaminated (both very ****ty lubricants) and it begins to wear out the eccentric lobe that drives the diaphragm, reducing fuel pressure. If the diaphragm tears fuel will show up in the clear overflow line.
I recently had my pump rebuilt, and we came up with what I hope will alleviate this somewhat. My mechanic drilled an outlet fitting into the bottom of the reservoir, so it can easily be dumped and changed. Otherwise it has to be sucked out with a vacuum pump, or the pump has to be removed and tilted and dumped.
Interestingly, my buddy's has never given him any trouble at all, and all we've done is change his lube a time or two......
Regards,
Steve