Can't tell from the parts lookup. Do HP500 EFI's come with triple valve springs? Mine has an outer, flat stock inner, and then a smaller round stock inner. They look really good but so does the rest of the engine so I don't know. Also the rockers have a C-07 on the end. Is this a production date?
Thread: 2 questions HP500 EFI
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03-01-2010 11:18 PM
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03-01-2010 11:39 PM
The spring is not a triple. It is called a double spring with a dampner. The flat one is the dampner. A triple spring has 3 actual springs.
Eddie
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03-02-2010 01:06 AM
I'm pretty sure that is what comes on them. They are Crane springs I believe. Someone else may know for sure.
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03-02-2010 08:47 AM
I think the later 500efi's run crane 929's and they are a double with a damper. I have a set of heads from a supposedly stock 500 and the springs are double with a damper.
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03-02-2010 10:27 AMYou're halfway done with the job. Change them. Springs are cheap.
Why take a chance?
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03-02-2010 10:38 AMIf you think that compressor makes alot of racket, just wait until you put a valve through a piston- in Early June.
I'm just not a believer in tempting fate.
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03-02-2010 12:21 PMOkay I just ordered new springs and keepers. Please don't look to closely at my Serious expense report this month
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03-03-2010 09:46 PMI'am pretty sure the mfg date is 07, I have seen dated and undated in the past. Are you going to inspect the lifters?
www.merperformancemarine.com
843-399-8785
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03-03-2010 11:23 PMActually I am trying to keep from removing the lower plenum. The engine had no lifter noise when I ran it and it's only got 320 hours.
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03-03-2010 11:25 PM
only ? 320 hours and you're not worried about the lifters
Thats Roll the dice IMHO
I would probably be swapping them out Ted.
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03-03-2010 11:37 PMReally? So how prevalent are lifter failures on these engines? Recommendations for replacements?
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03-04-2010 09:25 AM
Seen several with messed up cams when the roller fails. I would suggest Morels.
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03-04-2010 07:12 PM
+1
I witnessed one that had just the springs changed junk out a
lifter in short order.
The needle bearings and axles in the lifter get beat up when the springs
get weak.....they feel like they have gravel in them when you roll them
across a smooth surface.
The Morels Gellner sold me last summer weren't that much more than the
Cranes I bought a few years back.
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03-04-2010 07:51 PMThe only issue with the Morel is they're lifter bore diameter sensitive. They're machined to the GM spec, which is tighter than some of the aftermarket blocks. If the bore clearance is too large, the lifter won't get enough pressure to properly work. You'll want to mic the bore ID on the block before buying them. But on the Merc, I'd suspect you'll be just fine. Morels would be my choice for replacements. At around 300 hours, I doubt they're a necessity. But they are good insurance.
Hey Ted- you getting the feeling you're on the slippery slope to complete rebuilds yet?
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03-08-2010 09:13 AMWell, I hope you bastages are happy. Found a questionable looking intake valve last night with a borescope (New Snap On, cool as hell), after it leaked down too much. So now the heads are coming off and of course it will be getting new lifters, etc. Really glad I spent all that time putting springs on last week We do this sh!t to ourselves why?? As an aside a slightly pooched intake valve on a 320 hour motor that has never been cracked is pretty damn good I suppose.
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03-08-2010 09:17 AM
Thats ok Ted, you are about to find out the the heads have cracks between the valves all over the place
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