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[Datsun 1200 encyclopedia]

Timing Chain

(Difference between revisions)

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Categories: Engine Mechanical | Valvetrain

Revision as of 00:01, 13 June 2014
ddgonzal (Talk | contribs)

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Revision as of 00:07, 13 June 2014
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The [[Timing Chain]] drives the [[Camshaft]]. The [[Timing Chain]] drives the [[Camshaft]].
-Also see: [[Timing Cover]]+ Also see:
 + * [[Timing Cover]]
 + * [[Crankshaft Pulley]]
= Overview= = 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. 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+ 
 +NOT GOOD - early A10 single-row chain
<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] <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]
- +NOTE: 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+
- +
A-series engine has a short timing chain -- and with an automatic adjuster -- it rarely stretches or goes bad. A-series engine has a short timing chain -- and with an automatic adjuster -- it rarely stretches or goes bad.
Line 18: Line 19:
<br>[http://www.clutchkitcenter.com/media/images/TSET/TS10930/TS10930.jpg click] <br>[http://www.clutchkitcenter.com/media/images/TSET/TS10930/TS10930.jpg click]
<br><img size=240>http://www.clutchkitcenter.com/media/images/TSET/TS10930/TS10930.jpg</img> <br><img size=240>http://www.clutchkitcenter.com/media/images/TSET/TS10930/TS10930.jpg</img>
-* KA24 often has timing chain problems+<br>KA24 often has timing chain problems
= Replacement = = Replacement =
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[http://datsun1200.com/modules/myalbum/photo.php?lid=697 http://datsun1200.com/modules/myalbum/photos/thumbs/697.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=697 http://datsun1200.com/modules/myalbum/photos/thumbs/697.jpg]
-[http://datsun1200.com/modules/myalbum/photo.php?lid=3639 http://datsun1200.com/modules/myalbum/photos/thumbs/3639.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=3640 http://datsun1200.com/modules/myalbum/photos/thumbs/3640jpg]+[http://datsun1200.com/modules/myalbum/photo.php?lid=3639 http://datsun1200.com/modules/myalbum/photos/thumbs/3639.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=3640 http://datsun1200.com/modules/myalbum/photos/thumbs/3640.jpg]
[http://datsun1200.com/modules/myalbum/photo.php?lid=7339 http://datsun1200.com/modules/myalbum/photos/thumbs/7339.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=7340 http://datsun1200.com/modules/myalbum/photos/thumbs/7340.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=7339 http://datsun1200.com/modules/myalbum/photos/thumbs/7339.jpg] [http://datsun1200.com/modules/myalbum/photo.php?lid=7340 http://datsun1200.com/modules/myalbum/photos/thumbs/7340.jpg]
Line 76: Line 77:
Rollers: Double Rollers: Double
Timing Marks: 2 Timing Marks: 2
 +
 +== Crank Gear Key ==
 +Same key is used for the engine crankshaft pulley. See [[Crankshaft_Pulley#Part_Number|Crank Pulley Parts]].
== Tensioner == == Tensioner ==

Revision as of 00:07, 13 June 2014

The Timing Chain drives the Camshaft.

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.

NOT GOOD - early A10 single-row chain
24938.jpg 24939.jpg

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.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 3640.jpg

7339.jpg 7340.jpg


14366.jpg

Part Numbers

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

KIT SET
* CLOYES Part # 94054S RockAuto.com $35.79
  th_9-4054S.jpg
* CLEVITE/PERFECT CIRCLE Part # 92602
* ITM 05390500 RockAuto.com $32
  th_053-90500.jpg

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
  th_S478.jpg
* Beck/Arnley 0250282 $10.85
  th_0250282.jpg

Chain

Same as SRL311 with U20 engine (for Jackshaft)

CHAIN RockAuto.com
* CLOYES Part # S478 $9.40
* CLOYES 94054 $9.70
  th_94054.jpg
* BECK/ARNLEY Part # 0240226
th_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. See Crank Pulley Parts.

Tensioner

* CLOYES Part # 95005 RockAuto.com $3.90
th_95005-1.jpg th_95005-2.jpg
* ITM 60004 $6.37
  th_60004.jpg

Crank Sprocket

19 tooth Crankshaft Gear (Timing Crank Sprocket, Timing Crank Gear)
RockAuto.com
* CLOYES Part # S477 $8.87
  th_S477.jpg
* Sealed Power 223477 $6.17
* Beck/Arnley 0250258 $7.36
  th_0250258.jpg

USA

B110 RAW LIST
VALVETRAIN
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
PISTON, CRANKSHAFT & CONNECTING ROD
13021-H1000 SPROCKET-CRANK A12
12316-30000 KEY-WOODRUF 5X16 2 A12

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.

th_ps13kai_0399-img600x450-1335611934sqhy0p82792.jpg th_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

682.jpg Tomei 3639.jpg 3640.jpg

7339.jpg Rollermaster