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Dear Dave,
Hope you're well and that the New Year has started nicely and improves steadily!!!
Your answer is interesting. Is it the case, that Volvo briefly made engine pipes and catalytic converters, on which three-hole plates - welded into place - were secured to each other by three bolts, which compressed a gasket?
I ask, because the VADIS parts diagram for a 1989 or 1990 740 with B234 engine, shows an engine pipe, which has at the end closest to the catalytic converter, a flare, which retains a movable triangular, three-hole plate. This engine pipe requires a sealing ring (#1306852), to go between the catalytic converter and the engine pipe. The other end of this engine pipe end - the end bolted to the exhaust manifold - is in the same format, and uses the identical flat metal/fiber exhaust manifold gasket (#3531326), as that on any 940.
VADIS diagrams for 1989-90 740s, with the B234F engine, do not show any other format for engine pipe-to-manifold or engine pipe-to-catalytic converter connections. Thus, if VADIS is accurate, there is no "sealing ring" between the engine pipe and the exhaust manifold. There is only a flat fiber/metal gasket.
The engine pipe supplier told me they acquired this engine pipe from ANSA in 2001. ANSA's parts diagram does not show clearly the flared end, but it does show a sealing ring. That suggests ANSA pipes conform to the standard arrangement: a flared-end engine pipe and a flared-end on the input side of the cataltyic converter. ANSA uses Volvo part #6842565 to describe this pipe. Volvo pipe #6842565 has a movable, triangular, three-bolt hole plate, which is retained by a flared end.
In sum, you suggest that this ANSA pipe may be of an old and briefly-used format (flat, three-hole plates with a flat gasket), that was quickly superseded by a format based on flared pipe ends with movable three-hole plates, and a metal sealing ring. Is this correct?
Thanks again for your most helpful insights!!
Yours faithfully,
Spook
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