SoCal Jet Boats
Tech Talk => Engine Mechanical / Electrical => Topic started by: 79charger on April 12, 2010, 07:10:43 PM
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Coming back From Topock saturday i noticed a slight loss of power in my 460 . I nursed her home and did a compression check and found a low cylinder ...like 20 lbs .I popped the valve cover off and noticed the rocker arm was real sloppy and the spring was quite a bit lower than the others . Any chance the piston didnt hit that intake valve or is it pretty much a sure thing . Thanks
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i was out that way on saturday...what boat were you in
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Tan and brown Mini day . With Scoop on the carb .
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Question is valve spring New used or abused.
Is it a single or duel spring with dampener ?
what is you budget like ?
If old motor and you have some money pull both heads
have them checked. cheaper than a new motor.
Have new springs , retainer and locks in staled NO USED JUNK.
spend money on new valves & guides, 5 angle valve job, A lot eraser
to fix know than learn to walk on water.
:banghead:
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Have the heads inspected...They will tell the tale......5 angle v/j??? Why not Radius? :sly:....just ask'in.
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i think i might have seen you cruise by later in the afternoon maybe??
i was in a tan and white jet with ot's and a brown and yellow bimini top
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Find a bud or shop with one of them Bore scope camera deals to look at the piston through the spark plug hole. Odds are maybe 50/50 on the damage deal.
If you can't find someone with one, Home Depot sells a Milwaukee one for under $300 you can use to check it out, and we have a VERY liberal return policy.........But I didn't tell you that.........
Ray
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Well I lucked out ....kinda of... it wasn't a collapsed spring it was a broken lifter , I mean Really broken . I tryed fishing the broke piece out but it must have fell in the pan . I am going to dump the oil and try to flush it out . Really dont want to pull the motor. I am just looking for one more season out of this motor . One question is my intake runners on my heads our really nasty . They look like exhaust ports . Is this normal in a boat? Part of me wants to pull them off and hot tank them since i have the intake off but it ran great like this before the broken lifter . I am going to replace all lifters. At the minimum.
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replaced the lifters and fired right up . Close on wheewww. Thanks everyone
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Dude........what you've done here is worn a hole in the contact surface of the lifter. The cam is flat, period. It may run on the bandaid for a little while but start lookin for a cam...and another set of lifters.
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Replace cam/lifters...I agree ;D
check for other valve train probs. and contamination!
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Worn flat? You can see where the top of lifter sheared off . The guy at my local speedshop said it looks like It had fatigued and maybe i floated the valves and it gave way . Which could have been a possibility due to A wot run in choppy water . The lobe is still there and looks fine. I flushed the motor twice already . i know I am taking a risk by not tearing down the motor , but like I said I Need the rest of the season and I have a longblock waiting for a few final touches to be dropped in
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Ask him why the other lifter is flat at the bottom.best of luck. ;D
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You wont find the "piece"....It is now in the form of crankshaft honing abrasive... :thumbdown:
If you get three hours out of it, I'll eat my words, but that deal is done.......Sorry bro...Hope I'm way off.
GT
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I'm curious as to what brand lifter they are. I would like to make sure I don't
get one. Good luck, I hope it lasts for you.
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or the piece could be happily sitting against my magentic drain plug ........wishful thinking but thats all I have right now lol .
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Did you get it torn down yet? Good, bad or ugly?
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Changed all the lifters , flushed the motor with atf and two filters and oil changes . The initial oil didnt look contaminated . But who knows . Same compression I had 6 months ago and it , seems to run fine . I am going to take it out and give her a work out at my local lake to see if any problems come to fruition . Rather have it happen 15 minutes from home than 4 hours at the river . Hopefully I lucked out . I believe theres a bet on here for three hours it will last lol ...... who knows ????
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Changed all the lifters , flushed the motor with atf and two filters and oil changes . The initial oil didnt look contaminated . But who knows . Same compression I had 6 months ago and it , seems to run fine . I am going to take it out and give her a work out at my local lake to see if any problems come to fruition . Rather have it happen 15 minutes from home than 4 hours at the river . Hopefully I lucked out . I believe theres a bet on here for three hours it will last lol ...... who knows ????
It wasn't a bet, it was just a caution...
Did you repeat the cam break in procedures outlined by the cam manufacturer?
I hope so...Go buy two bottles of Comp break in additive or similar, you will be glad you did...
In all honesty, I hope it runs great, have fun and be safe.. :thumbup:
GT
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Yes I did re break in the cam with comp cams assembly lube. I was kidding about the bets for three hours ... I know too I will be lucky if it stays together the rest of the season . Wheres Obama with my stimulus package for my new motor lmao
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If you get a stimulus package for a new motor, lemme know, I need one for TWO motors! :screwy:
Ray