White Exec wrote: Tue May 25, 2021 3:08 pm
I was just very concerned about the finish on some of these seriously precious alloy wheels, not so much a one-off clean-up of a cylinder head.
I believe the only cleaning chemicals that are not either acid, or alkali, are detergents.
Acids are good for oxide removal, alkali (caustic) good for grease removal.
I think any ionic surfactant will be caustic.
As far as destruction of aluminium goes...ones skin would be adversely affected before the metal, but long term exposure would dissolve aluminium.
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Regarding the mechanicals. Did the engine workshop do any work to the valve guides, or was the sticking purely a result of the bent valve stems?
91 3.0 sei M. 4852 EXY Black
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Correct, bent at the top when the camshaft stopped dead. I am with Jim E today, we concur that it was the rockers that bent the top of the valve stems (x3) ZERO marks on the Valve heads or the Pistons. There is no movement of the valves in the guides and they all drop free with WD40 and slowly with 20/50 oil. The replacement valves in 1/8/12 fit fine as well (which is lucky).
The Cam belt did NOT break remember, it all jammed up solid with the Aux belt wrapping around the cam sprocket and the pump sprocket
Last edited by Stickfinger on Thu May 27, 2021 7:45 pm, edited 1 time in total.
Sounding good, and in some of the best hands in the game.
Take care of our Jim.
Chris 1996 XM 2.5TD Exclusive RP7165 Polar White 1992 BX19D Millesime RP5800 Sable 1989 BX19RD Delage Red Deceased; 1998 ZX 1.9D Avantage auto Triton Green Company car 1998..2001; 2001 Xantia 1.8i auto Wicked Red Company car 2001..2003
I didn't know the belt didn't snap at all, so the auxiliary belt wound round it and caused the cam timing to slip causing multiple sets of valves to meet the pistons of doom.
It should all be back together this weekend.
91 3.0 sei M. 4852 EXY Black
92 2.1 sed M. 5740 ECZ Sable Phenicien
92 3.0 V6-24. 5713 EXY Black
92 2.1 sd M. 5685 ENT Blue Sideral
Prev
90 2.1sd M. 5049 EJV Mandarin
92 2.1sd A. 5698 EJV Mandarin
94 2.1sd A. 6218 ERT Triton
91 2.0si M. 5187 EWT White
