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| = Overview= | = Overview= | ||
| - | * We have seen a couple of single link timing chains on A12, which is probably the original A10 single row chain. Insist on the factory specified double-chain, like Nissan did for later A10s. | + | 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. |
| + | <br>NOT GOOD | ||
| + | <br>[http://datsun1200.com/modules/myalbum/photo.php?lid=24938 http://datsun1200.com/uploads/thumbs/24938.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=24939 http://datsun1200.com/uploads/thumbs/24939.jpg] | ||
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| * A rattle can be the trait of a stretched timing chain. Pinging/pinking has also often been mistaken for timing chain rattle | * A rattle can be the trait of a stretched timing chain. Pinging/pinking has also often been mistaken for timing chain rattle | ||
Revision as of 07:08, 3 November 2012
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
- 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.
Compare to the loooooong chaing used in the Nissan KA24E engine:
click
- KA24 often has timing chain problems
Replacement
Alignment
Check the cam gear alignment. It should be exactly like this:
If it is not, see Camshaft#Timing.
http://datsun1200.com/modules/myalbum/photos/thumbs/3640jpg
Part Numbers
The timing chain kit (timing set) includes: Cam, Crank, Chain, Tensioner
- CLOYES Part # 94054S RockAuto.com $35.79
- CLEVITE/PERFECT CIRCLE Part # 92602
Cam Sprocket
(38 teeth)
- CLOYES Part # S47 RockAuto.com $9.41
Chain
Same as SRL311 with U20 engine (for Jackshaft)
- CLOYES Part # S478 RockAuto.com $9.40
- BECK/ARNLEY Part # 0240226
Tensioner
- CLOYES Part # 95005 RockAuto.com $3.90
Crank Sprocket
19 teeth
- CLOYES Part # S477 RockAuto.com $8.87
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
Tomei 
Rollermaster