CPTR71 Posted August 10, 2015 Report Share Posted August 10, 2015 Hi I have been getting inconsistent issues with my A type OD, Solenoid always clicks, but delay in OD engaging, but it always would, today, engage OD, and it either does nothing, no drop in rpm... or no drive at all which seems to happen now 90% of the time, but normal service resumes with OD off. Oil levels are ok... Any ideas, or pointers appreciated. Thanks Quote Link to post Share on other sites
RogerH Posted August 10, 2015 Report Share Posted August 10, 2015 It could be the cone clutch worn out/broken. Roger Quote Link to post Share on other sites
CPTR71 Posted August 10, 2015 Author Report Share Posted August 10, 2015 Ah, so recon gearbox...... Quote Link to post Share on other sites
RogerH Posted August 10, 2015 Report Share Posted August 10, 2015 No, recon OD But you may as well do the gearbox at the same time By the way - welcome to the forum. Roger Quote Link to post Share on other sites
CPTR71 Posted August 10, 2015 Author Report Share Posted August 10, 2015 Thanks Roger, Recon OD yes, the real pain is I had Pete do my gearbox last year! Quote Link to post Share on other sites
TriumphV8 Posted August 10, 2015 Report Share Posted August 10, 2015 The A-Type has an oil collector where oil under pressure is stored for the moment the switch is pressed to let the oil immediately swap behind the pistons to transfer the cone clutch to the other side. If there is a delay the hydraulic area is suspicious, often the collector is scratched due to debris in the oil from gearbox. That makes scratches on liner and piston and also makes defects on the piston rings. Also pump and valve should be checked like switch pistons and filter cleaned. To verify this the pressure at the switch valve should be measured before the gearbox is taken out of the car!!! Quote Link to post Share on other sites
AlanT Posted August 11, 2015 Report Share Posted August 11, 2015 Read the Buckeye articles: http://www.buckeyetriumphs.org/technical/AOD/AOD1/AOD1.htm The OD is much easier to work on than the gbox. Try a pressure gauge: https://www.flickr.com/gp/90670218@N04/G90135 Quote Link to post Share on other sites
Lebro Posted August 12, 2015 Report Share Posted August 12, 2015 Read the Buckeye articles: http://www.buckeyetriumphs.org/technical/AOD/AOD1/AOD1.htm The OD is much easier to work on than the gbox. Try a pressure gauge: https://www.flickr.com/gp/90670218@N04/G90135 Thats interesting, I have rebuilt many TR / Stag type gearboxes, but have never tackled an O/D perhaps I should next time (hope there won't be a next time) Bob. Quote Link to post Share on other sites
TriumphV8 Posted August 12, 2015 Report Share Posted August 12, 2015 If we are still talking about the A-Type it makes sense to look after the OD when gearbox is refurbished. There are two reasons: Other than the J-Type many hydraulic parts can not be accessed that easily from underneath/outside. The other reason is that the A-Type always provides pressurized oil to switch immedeately what needs a constant pressure in the hydraulic system. This causes more wear on the pumping system and the accumulator piston moves always during drive. When the gearbox looses some debris that is not catched by the filter it will surely find its way into the accumulator causing scratches and wear there. So a worn gearbox in front of an A-OD is always a hint to take a look inside the OD. Quote Link to post Share on other sites
AlanT Posted August 12, 2015 Report Share Posted August 12, 2015 There are a lot less parts in an O/D than a gbox. You need a few "special tools" but these can be improvised from bits of pipe and such: I'd say this is a practical overhaul for many keen mechanic-types. It's easy to make a rig to test it before you fit in the car. This can save a load of work. Quote Link to post Share on other sites
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