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[Datsun 1200 encyclopedia]

Timing Chain

Revision as of 10:09, 20 March 2019; view current revision
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Categories: Engine Mechanical | Valvetrain

The Timing Chain drives the Camshaft. The cam pulley is twice as big as the crank pulley, so the cam runs at exactly 1/2 the speed of the crankshaft.

Also see: 
* Timing Cover
* Crankshaft Pulley

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.

super-strong Double-Roller chain is standard
8966.jpgAlbum click to view

NOT GOOD - early A10 single-row chain
A10_timing_chain.jpg 24938.jpgAlbum click to view 24939.jpgAlbum click to view

NOTE: 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.jpgAlbum click to view

Compare to the loooooong chaing used in the Nissan KA24E engine:
TS10930.jpg
KA24 often has timing chain problems

Checking For Wear

If tensioner spindle projection is more than 15mm, replace chain. Rotate the engine clockwise a bit, then check the distance.

24796.jpgAlbum click to view

This ones looks to be at the limit:
25111-.jpgAlbum click to view

Replacement

14385.jpgAlbum click to view

Alignment

Check the cam gear alignment. It should be exactly like this:
174_4ee9b6405e4fc.jpgUpload click to view

If it is not lined up, see Camshaft_replacement#Timing.

Do not attempt to match up the bright/marked links on the chain. That only works the first time, as soon as you rotate the engine the links will no longer match (even though it is still in time)

Timing here is one tooth off (notice the key on bottom pulley)
PICT0428a.jpg

Slinger

Don't forget the oil slinger.

12302-18000 THROWER-OIL CRANKSHAFT

21479.jpgAlbum click to view

Part Numbers

Kit

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

KIT SET
CLOYES Part # 94054S RockAuto.com $35.79
9-4054S.jpg
CLEVITE/PERFECT CIRCLE Part # 92602
ITM 05390500 RockAuto.com $32
053-90500.jpg
STC SHIMIZU
Timing Kit NIS-A14 (includes sprockets)
Timing Chain Kit CK-NIS-A14 (no sprockets)
14366.jpgAlbum click to view

Cam Sprocket

38 tooth Cam Gear (timing gear)
* Sealed Power 223478 $3.50
* ITM 50022 $4.67
* ITM 50021 $4.67
* CLOYES Part # S47 RockAuto.com $9.41
  S478.jpg
* Beck/Arnley 0250282 $10.85
  0250282.jpg

Cam Sprocket Bolt

Special bolt 13082

13082-18000.jpg

Chain

Same as SRL311 with U20 engine (for Jackshaft)

CHAIN RockAuto.com
* CLOYES Part # S478 $9.40
* CLOYES 94054 $9.70
  94054.jpg
* BECK/ARNLEY Part # 0240226
  0240226.jpg
* ITM 2354 $7
specs
Links: 54
Pitch: 3/8 inch
Rollers: Double
Timing Marks: 2

Crank Gear Key

Same key is used for the engine crankshaft pulley.

12316-30000 KEY-WOODRUF 5X16 2

Tensioner

* CLOYES Part # 95005 RockAuto.com $3.90
  95005-1.jpg 95005-2.jpg
* ITM 60004 $6.37
  60004.jpg
Early non-return tensioner (A10 engine)
* 13070-18010 ASS'Y-TENSIONER, non-return B10 [double-chain]
  13070-18010.jpg

Early A12 engines (to April 1970) also used a tensioner on the Tension side of the chain. Apparently this was deemed unnecessary so was omitted starting May 1970.

13083-18001 TENSIONER-CHAIN TENSION SIDE -0470
13084-18000 SUPPORT-TENSIONER TENSION SIDE -0470
08110-62010 BOLT M6 FIXING TENSIONER -0470
13083-18001.jpg

Crank Sprocket

19 tooth Crankshaft Gear (Timing Crank Sprocket, Timing Crank Gear)
RockAuto.com
* CLOYES Part # S477 $8.87
  S477.jpg
* Sealed Power 223477 $6.17
* Beck/Arnley 0250258 $7.36
  0250258.jpg

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.

ps13kai_0399-img600x450-1335611934sqhy0p82792.jpg ps13kai_0399-img600x450-1335611934g5pec482792.jpg

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

fine-tuning the cam (Timing the camshaft)
3639.jpgAlbum click to view 3640.jpgAlbum click to view

Datsun100ATurbo homemade camshaft pulley
2980.jpgAlbum click to view

Pitroad
682.jpgAlbum click to view 174_5b2aac25d538b.jpgPost click for topic

Tomei
3639.jpgAlbum click to view 3640.jpgAlbum click to view 174_5b2aaa833efea.jpgPost click for topic 174_5b2aaa8bd739b.jpgPost click for topic

Rollmaster
7339.jpgAlbum click to view 697.jpgAlbum click to view

Kameari - buy at Brojects
21685.jpgAlbum click to view 21684.jpgAlbum click to view 174_5b2aa73a86c00.jpgPost click for topic 174_5b2aa5296d0ad.jpgPost click for topic 174_5b2aa547291a6.jpgPost click for topic 174_5b2aa5549e9ca.jpgPost click for topic 174_5b2aa56ba5299.jpgPost click for topic 174_5b2aa61f912ba.jpgPost click for topic 174_5b2aa62ba77a9.jpgPost click for topic

Gear Drive

Touring Sedan (TS) style
25686.jpgAlbum click to view 8324.jpgAlbum click to view