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11-21-2009, 08:09 PM
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#1
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Registered
Join Date: Jul 2009
Location: Indiana
Posts: 53
2003 Sonic 31ss w/ 575's
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575sci Head service
Looking for info on the 300 hour head service... the hubby is curious what other people are doing... valve seals, springs? Or complete new valvetrain... any ideas?
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11-21-2009, 10:02 PM
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#2
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I hate the winter!!
 Platinum Member
Join Date: Jul 2001
Location: long island, new york
Posts: 2,573
99 checkmate 259
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I rebuilt a pair of 575SC's last winter with about 300 hours or so. I planned on replacing the springs, upgrade to 10* Titanium retainers and 10* locks. The surprise was the valves were starting to tulip, so ended up replacing all the valves. Before Crane went out of business, ended up replacing all the rockers as well.
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11-21-2009, 11:48 PM
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#3
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Offshoreonly Advertiser
 Offshoreonly Advertiser
Join Date: Jan 2004
Location: Tennessee
Posts: 2,835
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At a minimum. replace the springs, retainers and locks(10* steel) and seals. I don't see a need to go to titanium retainers. The problem is the market is flooded with cheap import titanium retainers for around $200.Good titanium retainers will run $300+. You just won't see any benefit in a 575. It's just not worth the money. As far as the valves, that depends on how they look. As Vinny said, he replaced his because they were on their way out. Just wait to see what they look like. Hope this helps.
Eddie
__________________
True, Custom EFI and Carb. engines from 500 to 1500 HP. Also specializing in outdrive upgrades and repair, custom rigging and fabrication, we can handle all of your performance boating needs. See our entire engine line at www.YoungPerformanceMarine.com Contact us at 615-216-7449 or youngperformance@comcast.net
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11-22-2009, 01:49 AM
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#4
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Charter Member # 55
Charter Member
Join Date: Oct 2000
Location: Omaha
Posts: 11,046
32 Active Thunder
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What needs to be done will be determined after the heads come off and everything is checked. Minimum would be valve job, seals, springs and retainers.
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11-22-2009, 06:43 AM
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#5
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I hate the winter!!
Platinum Member
Join Date: Jul 2001
Location: long island, new york
Posts: 2,573
99 checkmate 259
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Eddie,
I agree, Titanium retainers on a hydraulic cam are not needed. However, after spending soooo much money on rebuilding everything else, I figured why not get Titanium. In any case, 10* locks are definately a good thing to add. Personally, I dont see why Merc ever used 7* locks.
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11-22-2009, 07:26 AM
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#6
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Registered
Join Date: Jul 2009
Location: Indiana
Posts: 53
2003 Sonic 31ss w/ 575's
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Thanks all for the info... thats what we are planning to do... plus blower service since they will be coming off... BTW, which are the better blowers...weiand or Holly? Our has holley stamped on the rear casing...
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11-22-2009, 12:01 PM
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#7
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Registered
Join Date: Mar 2009
Location: somewhere between paso & LA
Posts: 61
1998 Ultimate Warlock 25'sxt cat
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both are made by the Holley corp. now, only diff. is the holley
(B&M) HAS teflon stripped rotors, while the othert doesn't.
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11-22-2009, 12:04 PM
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#8
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Platinum Member
Platinum Member
Join Date: Jan 2001
Location: cedar springs mi
Posts: 496
99 sr24 htm
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sonicbunny the blower on the starboard side was just rebuilt by the blower shop before he lost the boat.
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11-22-2009, 12:24 PM
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#9
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Registered
Join Date: Jul 2007
Location: MI / MN
Posts: 386
2001 Profile 280 CAT
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The earlier 575s had Wieands, which were slightly better than the B&M version. The difference being front and rear oil bath bearings. Only the front bearings are oil bath and the rear bearings are sealed on the B&M. Either way the bearings are prone to fail.
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11-22-2009, 06:15 PM
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#10
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Offshoreonly Advertiser
Offshoreonly Advertiser
Join Date: Jan 2004
Location: Tennessee
Posts: 2,835
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Quote:
Originally Posted by Vinny P
Eddie,
Personally, I dont see why Merc ever used 7* locks.
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I could not agree more. You will never find 7* retainers in my shop. The point I was trying to make about the titanium retainers is to watch the imports. There are some cheap ones out there. It definitely can not hurt to go to titanium over steel, that's for sure.
Eddie
__________________
True, Custom EFI and Carb. engines from 500 to 1500 HP. Also specializing in outdrive upgrades and repair, custom rigging and fabrication, we can handle all of your performance boating needs. See our entire engine line at www.YoungPerformanceMarine.com Contact us at 615-216-7449 or youngperformance@comcast.net
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