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check valve & downshift shudders

To: mgs@autox.team.net
Subject: check valve & downshift shudders
From: PAINTRIX@aol.com
Date: Tue, 29 Aug 2000 07:32:27 EDT
left our local club picnic yesterday and while accelerating from a stop light 
a big whish noise came from the engine compartment.  Sounded like a big 
exhaust leak.  I pulled over and opened the hood and the "check valve" 
between the smog pump and the air injection manifold blew apart.  It looks 
like this is just a press in fitting as there are no threads on either side.  
What happened, why did the valve blow instead of the dry rotted, brittle 
rubber hoses. Are the valve and the related rubber hoses under a lot of 
pressure build up?  If I replace the valve can I just get rubber hose from a 
local auto supply house, or do I need to find heavy duty hoses. Moss does not 
show the hoses being available.

Question two.  
I've noticed during letting the clutch out from downshifting that I get alot 
of shutter feeling in the seat of my pants.  Feels like it is coming from the 
rear of the car even though the shifter really shakes at the same time.   I 
crawled under the car and nothing in the suspension seem loose,  I do not 
think the u-joints are gone as the driveshaft doesn't turn much by hand.  How 
would I tell if the engine / trans mounts are broken and allowing things to 
move too much. Or am I thinking wrong.  

the car by the way is a 78 MGB with a fully smogged motor.

Any help is appreciated.

Steve Petrosky

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