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equality72521's Avatar
 
Join Date: Jul 2006
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Am I crazy?

I'm thinking about tackling a valve job myself on my 930. I would need a machine shop to seat the valve properly but the rest I should be able to handle. Anyone else done this? Am I crazy to think I can do this? I've never tackled anything in car repair yet that I couldn't finish myself so I don't see why this will be any different. Opinions?
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 11-20-2007, 04:23 AM
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I guess if you've done a lot of valve jobs on other engines it would be no problem, but otherwise I don't think it's worth the hassle or risk.

I twin plugged my heads because I'm a shadetree machinist, but the whole time chips were flying I was asking myself why. One mistake and I just cost myself a head .
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Old 11-20-2007, 05:06 AM
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I would farm out the machine work, I would just do the disassebly and reassembly.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 11-20-2007, 05:34 AM
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[QUOTE=equality72521;3598349]I'm thinking about tackling a valve job myself on my 930. I would need a machine shop to seat the valve properly but the rest I should be able to handle. QUOTE]

So what is "the rest" that you're speaking of? If you're talking engine removal and disassembly of the top end then by all means go to it!

If you're talking about disassembly of the head etc.. just let the machine shop handle that part, you'll be glad you did. You've got to farm out the machine work anyway.. it's not worth the time, special tools, and busted hands. Bet you've never been pinched by a valve spring or keeper huh?

The machine shop will disassemble clean and inspect the heads, valves, guides, springs, retainers etc.. grind the new seat and install the guides if needed... and you?
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Old 11-20-2007, 08:46 AM
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[QUOTE=onboost;3598800]
Quote:
Originally Posted by equality72521 View Post
I'm thinking about tackling a valve job myself on my 930. I would need a machine shop to seat the valve properly but the rest I should be able to handle. QUOTE]

So what is "the rest" that you're speaking of? If you're talking engine removal and disassembly of the top end then by all means go to it!

If you're talking about disassembly of the head etc.. just let the machine shop handle that part, you'll be glad you did. You've got to farm out the machine work anyway.. it's not worth the time, special tools, and busted hands. Bet you've never been pinched by a valve spring or keeper huh?

The machine shop will disassemble clean and inspect the heads, valves, guides, springs, retainers etc.. grind the new seat and install the guides if needed... and you?
So, you think I'm crazy to do it. I'm thinking that the more I do myself the more money I have to replace my bad turbo and other things I need.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 11-20-2007, 08:52 AM
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Mark..

Wouldn't say you're crazy as I understand that thought process also... sometimes though, its better to let the guys who do it all the time do.. what they gotta do! Besides the difference in dollars you'll save by doing part of the work on the heads is just not significant enough for the hassle to that you'll encounter.
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Old 11-20-2007, 09:37 AM
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sudo apt-get purge 930
 
equality72521's Avatar
 
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Quote:
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Mark..

Wouldn't say you're crazy as I understand that thought process also... sometimes though, its better to let the guys who do it all the time do.. what they gotta do! Besides the difference in dollars you'll save by doing part of the work on the heads is just not significant enough for the hassle to that you'll encounter.
Alright, you talked me out of it. Thanks for the feedback.
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Mark 1979 930 Euro ***GONE AND DON'T MISS IT AT ALL***

"Worrying about depreciation on your car and keeping mileage down is like not ****ing your girlfriend so her next boyfriend finds her more appealing"
--clutch-monkey
Old 11-20-2007, 09:42 AM
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The cost of doing a valve job includes taking the heads apart so there no savings there. The only reason I can see for disassembling the heads is if you want to clean up the ports more than the glassbead blasting that the shop's going to do.
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Old 11-20-2007, 11:12 AM
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Quote:
Originally Posted by equality72521 View Post
I'm thinking about tackling a valve job myself on my 930. I would need a machine shop to seat the valve properly but the rest I should be able to handle. Anyone else done this? Am I crazy to think I can do this? I've never tackled anything in car repair yet that I couldn't finish myself so I don't see why this will be any different. Opinions?
I rebuilt the whole engine including the heads. I replaced the valve guides and reamed them. I was going to grind the seats myself at the local JC, but the stones they had were all too small. I would have had to grind all of there stones down in size and that would have pissed off all the V-8 guys. Anyway I had the seats ground (3 angle) for 5 bucks a head. I set up the installed valve spring height.

You can do it...
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Old 11-20-2007, 10:29 PM
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