Of course, in the TCM there is a protection mode which, when reaching a temperature of 129 C, in most cases blocks the torque converter, but it is better not to bring the transmission to a state for emergency modes. 16 you can see fresh oil, used – but still usable oil, and waste oil which should have been changed long ago.Ī transmission with fresh fluid is less prone to overheating – new oil carries away heat better. The oil gets dirty, and it is clearly seen by its color: in Fig. The fact is that this gearbox is very sensitive to the fluid characteristics, therefore I recommend to change oil every 20–30 thousand km. However, under our conditions, an oil change at least once a year or two will considerably reduce the chance of failures.
#Aisin tf 80sc shift kit manuals
In manuals for vehicles equipped with the TF-81SC and TF-80SC it can be specified that oil in this transmission is intended for the entire duration of its lifetime. If the rotor has signs of breakdown or severe wear, the pump assembly is to be replaced – not necessarily with a new one, a used one will do too if it is in mint condition. The pump can be restored only on condition that the rotor is intact: it is necessary to thoroughly inspect it because it is the first component affected by oil starvation. And, naturally, the leak is clearly seen during inspection. At low oil level, the pump was drawing in air making characteristic buzzing sounds. It resulted in oil leakage and, if the trouble was not corrected, the whole transmission could gо out of order. 14 (IMG_4281), 15 (IMG_4282)), because it was stuck to the torque converter front cover hub due to overheating. I have often encountered transmissions where the oil pump bushing spun (or slipped) (Fig.
#Aisin tf 80sc shift kit install
We install new Sonnax bearings, and these components are also produced by other manufacturers. The original bearing is not supplied separately, it can only be taken off from a used torque converter. It mostly occurs in transmissions working with diesel engines – such engines tend to develop a high torque even at low rpm. This does not happen often, and the cause of that is overload. Sometimes the one-way clutch bearing falls apart (Fig.
It still has to be replaced, but less frequently than before. And although in modern transmissions this problem has been eliminated, the friction plate still wears intensively – yet, now the wear is uniform. Due to such deformity, the friction material got worn unevenly (Fig.
The strengthening of the surface reduces the strain and alteration of the form of the bottom, which was often the case in the first generation of torque converters. Also, the bottom surface of its back cover became thicker on the transmission lock-up piston side (Fig. And in most cases the problem is associated with transmission overheat and infrequent oil change.Īs a result of the modernization, the torque converter got equipped with additional shock absorbing springs. The main source of trouble for a TF-81SC owner is usually the torque converter and the valve body. We are going to have a look at the transmission of Land Rover Freelander 2 (Fig. As a result, some of the “congenital” disorders and failures have been eliminated.
In 2010, this transmission was slightly modernized. They have slight diffĮrences in their design – namely, in the valve bodies (besides, there may be different varieties for the same vehicle model), and the TF-81SC differs from the TF-80SC in the number of frictions. Some manufacturers used a special labelling for this transmission – AF21 (TF-81SC) for Ford and AF40-6 (TF-80SC) for Ford and GM, AM6 for Peugeot and Citroen, AW6A-EL for Mazda. These transmissions work with engines from 1.9 to 4.4 L, the torque limitation being 450 Nm. This transmission designed for the transfer of quite a high torque is installed in models of various vehicle classes – С (OpelAstra, Chevrolet Cruze), Е (Volvo S80), as well as CUVs (Mazda CX-7 and CX-9) and minivans, or multi-purpose vehicles (Renault Espace). In order to have six gears in such limited space, the designers used the Lepelletier-type gearset (see “AKPPro” #3, p. That is why the transmission is quite space effective – its length is a mere 358 mm. The unit is intended for front-wheel and all-wheel drive vehicles with an east-west engine mounting. The Japanese company Aisin AW created the TF-80SC almost 15 years ago. Aisin AW TF-81SC: A vigorous veteran Vladimir Nasonov