TR7 Tensioner WRONG - Saab Saab Model 99 Bulletin Board - Saabnet.com
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TR7 Tensioner WRONG
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Posted by Don Wollum (more from Don Wollum) on Wed, 20 Aug 2008 19:32:24 Share Post by Email
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Tr7 tensioner controls tensions and is designed for a single row chain.
B motor chain is double row.Looks have nothing to do with parts application certifications. Physics,Lesson #1: single chain is 9.8 oz weight, double row chain is chain weights 15. 3 OZ.( guestimates but realistic) Chains are tensioned just off backside of crank at engine rpm, lets say 5,000 RPM. Mr. engine engineer need to have the spring tension set to restrain the outward centrifugal forces, tr7 requires a much lighter spring, the B or MGB double row tensioner will have a much heavier spring. #2 Mr Engine engineer also allows for a certain size oil entrance for auxillairy chain tensioning by hydrolics, with TR7 having less oil pressure admitted inside TR7 tensioner.Saab B and MGB tensioner have different oil pressure settings and are hydrologically designed to oil pressure tension ( assist the spring) for a double row chain. One would not put shocks designed for a 2,000 pound car on a 3.200 pound car because they look the same...Automotive engineering equivilants for spare parts are based on physics specifications and real science and engineering respect for the job at hand. MGB is double row chain positioned just off the back side of the crank sproket as the tensioner is on the Saab engine. If you want to use a off the shelf tensioner, for the obsolete Saab one. The MGB tensioneris the one that seems designed for the same intensity of a job and mic's for bolt holes and oil pipe port width and depth, and curve of rubber slipper is very close. MGB offering up instructions and the saab T/C ( transmission end) assembly procedures will have to be blended.

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