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4tec engine rebuild PLEASE HELP
- Thread starter fireboy
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sporsterjoel
New Member
Whats wrong with the head, and is the bottom end fine???
Mirage
New Member
I did a search on "google" for used SeaDoo parts, and found four heads in less than a minute... I don't know your location, but can give you a number to a gent. that I know does this work, and I would trust to do anything to mine!!!
Never mind, I see where you're from now...
Never mind, I see where you're from now...
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sporsterjoel
New Member
If head has no damage you can replace the parts on it. HOw many hrs on the motor, you should price out replacing all rockers, valves and valve springs if its higher hrs.
sporsterjoel
New Member
1st never buy a 4tec from sbt. 2nd if you get a shop manual then you can save some money and do it your self. Is the head damaged? can you post a pic of the head?
Mirage
New Member
I will be glad to get Steve's phone number, he can do anything to these things... Heck it's just a phone call, that's the worst you'd be out if you didn't like what he had to say!!!
Dropped exhaust...
Sounds like you dropped an exhaust valve.
Lot's of bad talk here about SBT but I just ordered my 12th engine and I never had to send one back. I had to call and get a gasket set sent, that was suppose to come with the motor. But I've had nothing but good luck.
I stopped rebuilding motors some years ago because it's so cheap just replacing them. I still piddle around with my HO 350 cu.in. as a hobby.
But, by the time you finish all the machine shop work and replace everything, you'll be way over what SBT charges for another motor. I"ve heard that their pistons were not of high quality but even that I have in question. Only because with a company that has bought out 2 other companies in the U.S. in the last 4 years, their reputation is pretty high for their products. Also, if there was a problem with their 4-TEC OEM remanafactured engines, I don't think it would be cost effictive to rebuild with a set of crappy pistons.
The 12 engines I have ordered have all been either 587, 717 or the 787 models. Nine of them were 787's. So, I have no experience working with them on the 4-TEC's..............But for cost, I'd check into it.
I'd also be careful about just doing an upper end repair. If you dropped a valve while on throttle, you might have metal pieces through the engine that if not found, could cause another failure. So, it you elect to do the upper end only, I'd at least take the engine completly down to do a complete inspection..............:cheers:
Sounds like you dropped an exhaust valve.
Lot's of bad talk here about SBT but I just ordered my 12th engine and I never had to send one back. I had to call and get a gasket set sent, that was suppose to come with the motor. But I've had nothing but good luck.
I stopped rebuilding motors some years ago because it's so cheap just replacing them. I still piddle around with my HO 350 cu.in. as a hobby.
But, by the time you finish all the machine shop work and replace everything, you'll be way over what SBT charges for another motor. I"ve heard that their pistons were not of high quality but even that I have in question. Only because with a company that has bought out 2 other companies in the U.S. in the last 4 years, their reputation is pretty high for their products. Also, if there was a problem with their 4-TEC OEM remanafactured engines, I don't think it would be cost effictive to rebuild with a set of crappy pistons.
The 12 engines I have ordered have all been either 587, 717 or the 787 models. Nine of them were 787's. So, I have no experience working with them on the 4-TEC's..............But for cost, I'd check into it.
I'd also be careful about just doing an upper end repair. If you dropped a valve while on throttle, you might have metal pieces through the engine that if not found, could cause another failure. So, it you elect to do the upper end only, I'd at least take the engine completly down to do a complete inspection..............:cheers:
sporsterjoel
New Member
Snip you right about the 2strokes from sbt there good it the 4tec that i dont trust and i believe there is a member on here that bought a 4tec from sbt and it blew up within a few hrs. I know they use cast pistions in the 215hp witch from the factory use forged, a 4tec is a very high tec motor that need everything to be 100% or your going to have problems. For the guy with 4tec id stay clear of an sbt rebuild your better off buying a used running motor. Im looking to buy a 2006 215hp 4tec tomorrow, guy wants $1000 he says its good but hes takin the timing chain off so he's is going to let me pull the head to verify that it is a good motor. It comes with mpem exhaust pto and everthing else but the supercharger and intake.
sporsterjoel
New Member
keep checkin ebay, criaglist, kijiji. Im not sure if you can use a 2006 head on your motor but if i buy this motor i might part it out so i might have a head forsale. Ill let you know tomorrow how i make out and if your interested ill dig in a little deeper and see if it will work for you.
sporsterjoel
New Member
If you know how to work on a car motor you will have no problems workin on these motors. only special tools i can think of that youll need to do head work is a valve spring compressor and a manual to be able to set the timing.
sporsterjoel
New Member
When the time comes to put the motor back in you should pull the drive shaft out first. Oh that reminds me youll also need an aligment tool for when you put the motor back in and to do that youll need to have the pump and drive shaft removed. I know SBT sells the tool but they might also rent the tool aswell. SEE guys SBT is good for something after all.
Stay away from craigslist. They are people looking to dump stuff that they can't sale any other way.
Sportsterjoel, I think I can see this as a good topic for debate. It may not be the right thread so as not to hijack but I have one theory on this, that I kinda touch base with in the above post and that's their reputation and their guarantee.
If they know that the forged pistons verses the cast are not compatible and cause issues like blown pistons or problems that would would cause constant recalls for repair, to honor their warranty for their impeccable reputation, it's not worth using sub standard parts and having to take them back and replacing them. They'd lose so much money, they'd literally go bankrupt, not to speak about their reputation ending up in the toilet.
When I used to build my high output 350 cu.in motors, we used Weisco forged pistons. When you look at the few type ways pistons are made and how much you want to spend on them, it usually depends on what type service you are using them for. The 3 main type high performance pistons are cast, hypereutectic and forged. The cast being the most widely used has not shown that there is some kind of issue with the use of these in the 4 TEC, or like I said, rather than SBT putting their reputation on the line by using inferior products, I don't see this happening.
So now, I'm on my way to open a thread on the differences between the cast and forged pistons............:cheers:
timmyboy76
New Member
they are, but they wanna sword fight about a engine supplier...:rofl:
Common sense, youd have to see it the way Snipe does, if (sbt) saw a problem early on, with a particular set-up, doesnt take a brain surgeon to figure out, that something needs to be done/resolved. Cant see them, turn'n back on it ,and let "warranty" fix it.
ski-d00
Well-Known Member
I've rebuilt quite a few 4tecs and have lots of good used parts, pretty sure I have a good 155 head if you need one.
They are not too difficult to rebuild and you can do it yourself if you are familiar with basic engine rebuilding practices and you have the right tools but there is no replacement for experience.
I've only had one major issue with an SBT motor that had to be sent back and been a dealer for them for years. However, I still build almost all of the motors that I rebuild. It's just cheaper for me to rebuild myself, but I get pretty good prices on everything and only pay $25/hole for boring/chamfering.
They are not too difficult to rebuild and you can do it yourself if you are familiar with basic engine rebuilding practices and you have the right tools but there is no replacement for experience.
I've only had one major issue with an SBT motor that had to be sent back and been a dealer for them for years. However, I still build almost all of the motors that I rebuild. It's just cheaper for me to rebuild myself, but I get pretty good prices on everything and only pay $25/hole for boring/chamfering.
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