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Aluminum heads will also have a valve spring shim to keep the spring from wearing away the aluminum. An ideal method of rebuilding the cylinder head would involve replacing all of the valves, guides, seats, springs, etc. with new ones. However, depending on how the engine was maintained, often this is not necessary.
26 May 2015
5 Apr 2012 The guides are cracked from the bent valves (Sorry about the pic,) The tools needed for this is an air hammer, a regular hammer, venire calipers, and the proper sized guide driver. Also the replacement valve guides are shown. Have the head with the deck side up. With the guide driver in the air hammer,
12 Oct 2016
17 Mar 2017 During the service of a cylinder head, the mechanic is often faced with the question of whether or not to replace the valve guides. These simple pieces operate in a harsh environment (particularly the exhaust guides) and are subject to wear over long periods. All aluminum cylinder heads use a valve guide
Remember that you are working with a relatively soft metal (aluminum), and you do not want to grind into the metal. If you have access to a machine shop that works on aluminum heads, ask them about glass-beading the cylinder head. Checking the Valve Stem-to-Guide Clearance. (Valve Rock). Click image to see an
1 Jul 1996 repair options from which to choose. Most rebuilders either go with thin wall bronze liners and reclaimed valves, or install new or rechromed valves with oversized stems. Replacing guides is another option with aluminum heads as well as some cast iron heads, as is knurling. Most rebuilders have tried all of
14 Jun 2016 You have a few options when removing valve guides from aluminum and cast-iron heads. You can. drive them out and replace them with new guides; ream the original guides to accept oversize valve stems; ream worn guides and insert liners. The choice is pretty much yours. Goodson, of course, carries
Many builders don't have the correct equipment to properly remove and install valve guides, so they use force instead. Hammering an old guide out of a head can score and damage the head so as to not have a nice surface for the new guide. We have seen people with a guide they try to force out shatter, so then they end
Valve guides in an aluminum cylinder head eventually wear out, leading to excessive oil burning. Oil leaks down the space between valve shaft and guide. Furthermore, a worn guide puts excessive side pressure on the rocker arm and camshaft, if it's an overhead cam. This will lead to premature wear on the rocker arm

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February 2018