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Location:
Brisbane
Registered:
July 2004
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Taking the head of 7M- advice for 1st timer??
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Fri, 31 December 2004 00:52
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Hi all,
Unfortunatley I come to the conclusion that the 2JZ-Ge conversion is too expensive/ time consuming at this stage, so I'm going to devote next week to fixing my overheating car once and for all, by myself (well...at least 12 months or so of reliable driving would be good).Was just wondering if anyone could give me some advice on taking the head of a 7M-GE.
I intend to follow the steps outlined in the toyota manual, but basically follow this method:
Disconnect battery
Drain and remove radiator (for easier access)
Remove fan and clutch
Remove inlet crossover pipe and airbox
Disconnect all sensors and wiring
Take off the timing cover
Mark and remove the distributor
Unbolt the exhaust manifold at the head
Leave the inlet manifold on for now.
Remove cam covers, sparkplugs, plug valley cover
slip timing belt off cam pulleys
Undo the head bolts in sequence
Try to lift the whole thing up by hand (with help).
I've probably forgotten a few steps tho...
The head will be subsequently sent of to the engineers to be fully checked out and if there's ANYTHING wrong - significant warpage, more corrosion, dodgy previous repair jobs, a crack etc.. then its going into the bin and i'll source another head and have that fully rebuilt if necessary -plus have the thing shaved for higher compression whilst i'm there.
Also i will pull out the injectors off and have them professionally cleaned, plus send the radiator off to the shop to have the tanks removed and the core cleaned (....again!) Plus pull the throttle body off myself and give it a good scrub.
As far as i can tell the biggest pitfalls would be:
keeping everyhing aligned- all you need to do to ensure this is set the timing to 0 (piston 1 @ TDC), and when reinstalling the timing belt ensure that the marks on the cam pulles align... is this correct?
Lifting the head off the motor- i've heard this is far from easy in most cases
Unbolting the exhaust manifold- ie: access to bolts and chances of them being complete bitches to remove if they're rusted on or something.
I've just got a few other questions:
Should i bother to drain the oil or just change it after its all put back together?
When putting the head back on, do i need to lubricate anything for initial startup? (l was thinking just shove some oil on the cam followers, that sort of thing)
When the head is off should i attempt to clean all the carbon and crap off the top of the pistions or i'm thinking this is a big no no??
With these 7M heads- can the valve stem seals be replaced cheaply or is it usually done in conjunction with a full head rebuild (which was only done on this car earlier in the year)
Should i get the cold start injector cleaned aswell or is this unnecessary?
When should i reattach the inlet manifold- after reinstalling the head or would it be easier to do before? (i'm thinking after...)
What is the recommended amount to shave off the head for higher compression without affecting valve clearance or reliabilty??
Finally what parts are typically required: At this stage its
New head gasket, inlet and exhaust manifold gaskets, cam cover gaskets (maybe..), throttle body gasket, a set of those little o rings that seal the injectors, maybe a distributor o ring, have i forgotten anything?? Oh and a new timing belt of course....
Sorry for my huge list of quesitons, I would really appreciate help from all blown head gasket veterans as it seems to be a bit of a daunting task at the moment....
Cheers.
[Updated on: Fri, 31 December 2004 00:54]
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Location:
Rocklea qld
Registered:
February 2003
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Re: Taking the head of 7M- advice for 1st timer??
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Fri, 31 December 2004 09:22
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first thing u do it set the engine to TDC...
why are u pulling the head off...are u sure its a head problem???
also dipp all your head bolts in oil before installing them..basically dipp everything in oil as u iuinstall it to make sure its lubbed
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Location:
Brisbane
Registered:
June 2003
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Re: Taking the head of 7M- advice for 1st timer??
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Sat, 01 January 2005 12:11
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search Toyota service repair manual on the internet.
Theres a supra manual - follow its guidance to change the head. Don't take on such a project if you dont know 100% what you are doing. Do it dodgy and it will blow again and start boiling in no time at all....
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Location:
Brisbane
Registered:
February 2003
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Re: Taking the head of 7M- advice for 1st timer??
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Sat, 01 January 2005 12:39
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you'll be wanting to read this:
http://www.cygnusx1.net/supra/library/TSRM/index.h tml
and download the entire thing if you have some sort of site sucking program.
it has a lot of what you're after
cheers, charles.
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I Supported Toymods
Location:
south Melbourne/KL
Registered:
June 2004
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Re: Taking the head of 7M- advice for 1st timer??
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Sat, 01 January 2005 21:18
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word of advice, assembling things back together is much harder than taking it apart. good luck with all the frustrating days ahead. only way to learn stuff is the hardway 
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Location:
Brisbane
Registered:
July 2004
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Re: Taking the head of 7M- advice for 1st timer??
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Sun, 02 January 2005 07:38
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Well i'm getting there- got everything off 'cept the inlet manifold, the head bolts themselves and the timing belt. I'll try leave the manifold on and remove it after i've lifted the head.
To tell the truth the hardest part so far was unclipping all the connectors from the loom to move it out of the way- those things are bastards to seperate, especially the four that run past the inlet manifold and along to the transmission..  ...but suppose the games haven't really started yet. 
Fingers crossed this time next week i'll have the car close to being together again..hopefully.
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Location:
Brisbane
Registered:
November 2002
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Re: Taking the head of 7M- advice for 1st timer??
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Mon, 03 January 2005 04:24
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My advice is that the head is bloody heavy enough by itself without the manifold still attached. It's not so much heavy as the fact that it's awkward at the same time. Ditch the manifold, it has to come off anyway.. with the right combination of extensions all the bolts are easy to get at.
There's not really much you can do wrong except:
* fail to clean deck surface properly
* fail to torque bolts up correctly and evenly in a reasonable pattern
* fail to flush and clean cooling system correctly
* fail to reinstall timing gear correctly
There are other things you can get wrong but none of it is hard to rectify or will cause you tears.
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