At 09:28 AM 5/13/99 -0700, Michael Taylor wrote:
>Hello,
>
>I need to clarify something I said earlier: The timing belt break on
>an XU9J4 engine will cause catastrophic valve and guide damage. However,
>since mine broke by having the belt get its teeth (cogs) shaven off while
>still rotating the cams, all 16 valves got trashed. If an engine has a
>distinct belt breakage, it is possible that fewer than 10 valves
>have been bent. Perhaps someone here could attest to how many valves
>have been crushed on their typical broken belt head crashes. The bottom
>line is, however, that you will be off the road with that car for close
>to 2 weeks, if everything that needs to happen does happen on time
>with no hitches. I was down for a good 4 weeks with my disaster. I
>bent 2 brand new valves during timing belt installation, by pinning the
>intake camshaft into proper position and then attempting to index the
>exhaust cam into position and striking the wide open intake valves for
>cylinder #4 with its intake valves, so I had to have the valves fixed
>after removing the head over again and then re-ordering another $65
>headgasket, etc. Needless to say, I won't be making that mistake again.
>It was not until then that I knew that: a) the intake cam pins into
>index timing belt installation position with two valves at their max
>open position, and b) that the valves from opposing sides of the head
>can actually strike each other. :^(
>
>Mike Taylor, Nashua, NH
>
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