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[Datsun 1200 encyclopedia]

Timing Chain

Revision as of 07:08, 3 November 2012; view current revision
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Categories: Engine Mechanical | Valvetrain

The Timing Chain drives the Camshaft.

Also see: Timing Cover

Contents

Overview

We have seen a couple of single link timing chains on A12, which is the original A10 single row chain. Insist on the factory specified double-chain, like Nissan did for later A10s.
NOT GOOD
24938.jpg 24939.jpg


  • A rattle can be the trait of a stretched timing chain. Pinging/pinking has also often been mistaken for timing chain rattle


A-series engine has a short timing chain -- and with an automatic adjuster -- it rarely stretches or goes bad.
24803.jpg

Compare to the loooooong chaing used in the Nissan KA24E engine:
click

  • KA24 often has timing chain problems

Replacement

14385.jpg

Alignment

Check the cam gear alignment. It should be exactly like this:

174_4ee9b6405e4fc.jpg

If it is not, see Camshaft#Timing.


697.jpg

3639.jpg http://datsun1200.com/modules/myalbum/photos/thumbs/3640jpg

7339.jpg 7340.jpg


14366.jpg

Part Numbers

The timing chain kit (timing set) includes: Cam, Crank, Chain, Tensioner

94054S.jpg

Cam Sprocket

(38 teeth)

S478.jpg


Chain

Same as SRL311 with U20 engine (for Jackshaft)

94054.jpg

Tensioner

Crank Sprocket

19 teeth

S477.jpg

USA

B110 RAW LIST
13024-H8500 SPROCKET-CAMSHAFT
13024-18001 SPROCKET-CAMSHAFT
13082-18000 BOLT-CAMSHAFT SPROCKET
13030-18000 WASHER-CAMSHAFT
08915-2401A WASHER-LOCK
08915-14010 WASHER-LOCK
13028-18001 CHAIN-CAMSHAFT
13070-18001 ASSY-TENSIONER CHAIN
08120-63510 BOLT-FIXING CHAIN TENSIONER
08915-13610 WASHER-LOCK FIXING CHAIN TENSIONER

Adjustable Cam Gear

Fitting an adjustable Camshaft gear lets you fine tune the timing. The cam vendor's recommendations are usually best, but retarding the cam a degree or two will generall shift the torque curve higher up in the RPM range. Advancing the cam will (usually) lower the power curve a few RPM. Adjustable gears come in a few basic kinds:

  • Multi-key. Rollmaster had one with nine adjustible keys in the crank sprocket
  • Multi-hole. Using different holes
  • Variable: Slotted holes allow a continuously variable range

682.jpg Tomei 3639.jpg 3640.jpg

7339.jpg Rollermaster