M/T - Road Test

NO.
819

GROUP
43

SECTION
4

DATE
June -97

Test driving manual transmission
850

REFERENCE:
TP 4101201, SECTION 4(41, 43, 46) M56 MANUAL TRANSMISSION, INCL. CLUTCH AND DRIVESHAFTS; 850 1992-

Test driving manual transmission

Background:
In case of customer complaints about gear change quality or noise from the transmission, the test driving schedule in this Service Bulletin can be used for fault-tracing, the correct diagnosis and service corrections. This applies to all Volvo 850/C70/S70/V70 with manual transmissions.

Preparations:
Check the transmission oil level before test driving. To achieve the normal transmission operating temperature and ensure that the aluminum transmission housing is at the correct temperature, the car should be driven for approximately 20 minutes before the road test begins.

Note the car VIN number, mileage, transmission P/N and serial number.

Test:

^ Stationary with engine idling, clutch pedal fully depressed and gear selector lever in neutral. Release the clutch, listen for mechanical noise, and if the noise occurs with the clutch pedal depressed or released. Repeat 10 times.

^ Stationary with the engine idling, fully depress the clutch pedal and wait for 3 seconds, put into back-up (reverse) gear, then 1st gear and then back-up (reverse) gear again. Move the gear selector lever to neutral and release the clutch pedal.

Repeat the procedure but wait for 20 seconds instead of 3.

Note any differences in noise or sluggishness in selecting gear after the different waiting times.

Check where the clutch engages and if the clutch sticks or causes noise when depressed. Place in back-up (reverse) gear and accelerate to approximately 2500 rpm. Note any noise or other problems.

^ Drive the car on a motorway or similar. Put into 1st gear, accelerate and change 1-2 and 2-3 with engine speed (RPM) at approximately 4000 rpm. Then change 3-4 and 4-5 at as high engine speed (RPM) as possible, although no higher than 4000 rpm. Engine brake and change down through all gears at approximately 3000 rpm.

Note any difficulties in putting into gear, if any gears jump out or if there is noise at any gearchange.

Repeat the test above changing up at approximately 5000 rpm and changing down at 3000 rpm.

^ Drive the car in 4th gear at 90-100 km/h (56-62 mi/h) with even acceleration for approximately 1 minute *) Put into 5th gear, release the clutch for a moment, depress the clutch and put into 4th gear again.

Repeat six times.
Note any problems.

*) Note:
This should only be done if traffic conditions and speed limits allow it.

WARRANTY STATEMENT: Claims may be submitted under the New Car Limited Warranty when a manufacturing defect is present using claim type: 01

Operation No. Labor description Time allowance

43918-2 Manual transmission road test 0.8 hr