L322 gearbox

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navigator16078

New Member
Posts
247
Hi
when i put my 4.4 02 hse in d and start off the engine revs then there is a bang and the car sets off its just like someone has driven into the back of me. Any idears please.


Thanks lbf
 
It has to be one of two things really. It’s either an A-clutch problem or there’s a problem with the 1st gear sprag (one way clutch).

If there’s a hydraulic leak in (or to) the A-clutch then there may be insufficient flow from the pump to generate enough pressure to engage the clutch at tickover but the increase in flow produced from raising the engine revs (& hence oil pump speed) then overtakes the leakage, generates pressure & the clutch engages with a bang. The level of leakage is likely to be fluid viscosity dependent which is why I was asking if it varies with temperature.

The other option is the F-brake sprag. To test this you need to engage 1st gear manually which will override the sprag and engage the F-brake (this function is there to provide engine braking in 1st gear on demand). Would you be able to give this a try & see if it changes the speed at which 1st is engaged?
 
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