halffast

I just removed a failed SS crowler rocker from my 572 nat asp last weekend.It broke around the bottom of the pivot area and all the rollers fell and broke out.I do not know any history of this motor rpms or hours so I will probably go back with them again .I am considering jesel stuff.Motor's apart now for a refresh. hf... I got pics if anybody wants em. sho miss my boat when it's broke

catman01

Please send detailed pics to [email protected] I would like to see the break area and get some input from my guy at Crower before I make the move to their s-steel rockers. Are they shaft mount and do you know approx how old it is? Thanks, Rob

articfriends

iTrader: (1)

Rob, at first glance the crower stainless rockers (IF they actually make a drop in replacement) sound like a bargain BUT keep in mind the weight difference between profiled t/ds made from Chrome moly vs the 17-4ph stainless Crowers, My new steel T/D exhaust rockers looked like skeletons-definately profiled to be extremely light. IF your valve train is spec'd out to exactly the rpm's you are running and you add 30+ grams of weight to control a valve spring change might be in order and will kill any savings you might have . Example-you designed valve train with lets say 250 seat and 600 opened pressure and everything is stabil to 6600 and you set rev limiter to 6500 if you throw in some extra weight you could see loss of valve control. Now, if you put springs in that were way over kill it would be a moot point, let us know what you do. I swapped out my Exhaust rockers at 105 hours or so (I figured 11 milion cycles or so), I mighta been able to run them much longer but didn't want to chance it , I would give them to you minus the shafts (I re-used them) if it would help get you back on water for rest of the season, Smitty

halffast

Sent ya the pics catman01. hf...

catman01

Smitty, Thanks for the offer of the rockers but I still have a couple spares left and doubt that I will get out boating anymore this season. The Crowers can be fitted in the T&D stands by machining the sides of the Crower rockers which they have offered to do and that is included in the price that I posted. Rocker weight becomes more of a concern the higher you spin the engine. The moment of inertia is probably the most important thing to consider and at the RPM's that these engines turn (6300) I doubt that these will cause any problems as I believe that the moment of inertia is similar. Feel free to give me your thoughts on this. Rob

catman01

halffast, just looked at the pics and I will forward them on and let you know what I get for an answer. Thanks for sending them, Rob

RBH

We pick up our last card at Wolf Creek Marina and headed to Harmon Creek and one broke.....limped back to State Dock and began drinking. ...not a bad day...ran great up to that point. Got it back together tonight...all well.

catman01

Crower also offers a chrome moly replacement that can be fitted. Anyone else have T&D that would like to share their experience?

halffast

With my refresh I got some decisions to make.I had a solid lifter roller cam.Should I give up a little hp and go hyd roller ? Is there better valve and top end life going this route ? Never had these problems with two big ole mercury race outboards on da back !! hf...