Dodge 318 Timing Chain Marks: LA and 5.2 Magnum Alignment Guide
Dodge 318 timing-chain mark guide covering crank and cam dot alignment, LA versus 5.2 Magnum identification.
For a conventional Dodge/Chrysler 318 timing set, place the camshaft and crankshaft sprockets so their timing marks are next to each other on the exact centerline through both sprocket bores—normally the crank mark at 12 o'clock and the cam mark at 6 o'clock. Fit the chain to both sprockets on the bench, then slide the sprockets onto the cam and crank together and verify the two marks with a straightedge. The Chrysler procedure warns against allowing the camshaft to move rearward while the sprocket is installed.
The useful factory instruction for a 318 is more precise than 'put the dots together.' Chrysler says the timing marks must lie on an imaginary line through the centers of both sprocket bores. The chain and both sprockets are assembled as a unit and pushed apart before a straightedge confirms that line. This prevents a mark that merely looks close from hiding a one-tooth error.
Identification is equally important. A 1960s LA 318 can have a mechanical fuel-pump eccentric and different front-accessory arrangement, while a 1990s 5.2 Magnum uses electronic fuel injection and different cam/distributor details. An earlier A-series poly 318 is a separate architecture. The displacement alone is not a parts lookup.
This page keeps the broad keyword indexable with an explicit limitation because the available factory procedure reproduction does not establish one ignition-timing value or one fastener specification for every 318 year. It still provides a crawlable, source-linked mechanical method and a checklist for selecting the correct year manual.
Interactive 318 timing-chain alignment map
Branded downloads includedPNG and PDF exports carry the TorqueSheet logo, torquesheet.com, source-page URL, and republishing attribution request. The PDF source link is clickable.
Front-view functional map. The two sprocket marks must sit on the exact line through both shaft centers; verify the installed set and engine family before tightening.
Dodge 318 Timing Chain Marks Diagram
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Crank sprocket mark | 12 o'clock | On common sprocket-center line |
| Cam sprocket mark | 6 o'clock | Adjacent to crank mark |
| Installation | Chain on both sprockets; slide on together | Recheck with straightedge |
| Dot-to-dot firing position | Cylinder 6 | Rotate crank one turn for cylinder 1 compression |
| Firing order | 1-8-4-3-6-5-7-2 | Verify distributor rotation/terminal layout by application |
The name 318 covers the earlier polyspherical A engine, the LA 318 and the later 5.2L Magnum. This page focuses on LA and Magnum-style conventional chain drives, but front covers, fuel-pump eccentrics, cam thrust hardware, distributor/oil-pump drive setup and ignition timing vary. Dot-to-dot is a mechanical cam reference and places cylinder 6 on its firing stroke; rotate the crank one full revolution before indexing the distributor for cylinder 1 compression.
How to use this specification correctly
- 01
Identify A-series poly, LA 318 or Magnum 5.2L from block/head/valve-cover features, VIN and year; obtain the exact service manual and timing-set instructions.
- 02
Before disassembly, place the engine at a documented reference, record distributor rotor/housing positions and check cam endplay and chain slack if diagnosing rather than rebuilding.
- 03
Remove the balancer and front cover with the correct puller and protect the front oil-pan seal. On applicable LA engines, record the fuel-pump eccentric and washer orientation.
- 04
Remove the distributor and oil-pump/distributor drive as the service procedure requires. Install the specified camshaft support tool so sprocket installation cannot push the cam into the rear Welch plug.
- 05
On the bench, orient the crank sprocket mark toward 12 o'clock and the cam sprocket mark toward 6 o'clock, directly adjacent on the line through both bores.
- 06
Fit the chain around both sprockets and spread them as far apart as chain slack permits. Lay a straightedge through both bore centers and confirm both marks lie on it.
- 07
Align the crank key/keyway and cam locating feature, then slide the two sprockets and chain evenly onto both shafts at the same time. Do not walk one sprocket on ahead of the other.
- 08
Recheck the straightedge alignment, sprocket seating, cam thrust plate, endplay, eccentric and fastener stack. Tighten with the exact year/part procedure.
- 09
Rotate the crankshaft clockwise by hand for two complete turns and verify smooth movement and mechanical timing. Colored links, if an aftermarket set has them, are secondary to sprocket marks and instructions.
- 10
For distributor installation, rotate one full crank revolution from dot-to-dot to cylinder-1 compression TDC, align the oil-pump/distributor drive and rotor using the year-specific procedure, then set ignition timing from the emissions label/manual.
LA 318 versus 5.2 Magnum
The LA and Magnum engines share the basic small-block lineage and a crank-to-cam chain, but they are not identical service applications. Magnum engines use different heads, intake, valvetrain and fuel/ignition controls; LA front covers may support a mechanical fuel pump and eccentric.
Confirm whether the cam is flat-tappet or roller, whether a thrust plate/tensioner has been added and whether the timing set has multiple crank keyways. An aftermarket advance/retard keyway must be selected by its own instructions, not by assuming every visible dot is the zero position.
Why both sprockets install together
With the chain already engaged and the sprockets separated to remove slack, their tooth relationship is fixed before either reaches the shaft. Sliding both on evenly prevents the chain from forcing one shaft out of position.
The factory procedure also calls for a cam-support tool at the rear side of the cam gear. Hammering or drawing the sprocket on without controlling rearward cam movement can damage the rear plug or upset endplay hardware.
Dot-to-dot and distributor position
With the two marks adjacent, the cam is phased correctly to the crank but cylinder 6 is in its firing position. Cylinder 1 is at top dead center on overlap. Installing the distributor as though #1 were ready can produce a no-start or backfire commonly described as being 180 degrees out.
Rotate the crank exactly one revolution; the crank returns to TDC while the cam turns half a revolution, putting cylinder 1 on compression. Confirm both #1 valves are closed before choosing the #1 cap terminal.
Chain wear and verification
A worn silent chain can retard cam timing and make ignition marks unstable. The archived Chrysler procedure includes a valve-lift timing check and directs inspection of sprocket index marks, chain wear and the damper TDC mark when results are outside range.
Do not diagnose stretch only by the amount of visible slack with the cover off unless the year manual gives that test. Check tooth wear, nylon-coated gear damage where applicable, shaft endplay and true TDC together.
Final assembly checklist
- Correct LA/Magnum/poly engine family identified
- Timing-set zero keyway identified
- Cam support tool installed where procedure requires
- Crank mark and cam mark adjacent on exact centerline
- Both sprockets installed simultaneously
- Straightedge alignment rechecked after seating
- Thrust plate/endplay and fuel-pump eccentric verified
- Engine rotates smoothly by hand
- Cylinder 1 compression confirmed before distributor installation
- Ignition timing taken from exact vehicle label/manual
Dodge 318 LA / 5.2L Magnum V8 specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Dodge 318 Timing Chain Marks: LA and 5.2 Magnum Alignment Guide FAQs
Where do Dodge 318 timing-chain marks point?+
On a conventional zero-position set, the crank mark points up and the cam mark points down so the marks are adjacent on the exact line through both shaft centers.
Do I install the 318 sprockets one at a time?+
The Chrysler procedure fits the chain to both sprockets first and slides both sprockets onto their shafts evenly as one assembly.
Is dot-to-dot cylinder 1 compression on a 318?+
No. It corresponds to cylinder 6 firing. Rotate the crank one complete revolution to put cylinder 1 at compression TDC.
Are LA 318 and Magnum 5.2 timing procedures identical?+
They share the basic mark relationship, but front cover, cam, thrust, fuel-pump and ignition details vary. Use the exact year manual.
Why is a camshaft support tool mentioned?+
Chrysler's procedure uses Tool C-3509 to prevent sprocket installation from pushing the camshaft rearward into the block's rear plug.
What initial ignition timing should a Dodge 318 use?+
That varies by year, vehicle, distributor and emissions calibration. Use the underhood label or application-specific service manual rather than a generic number.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Mopar Performance Parts catalogMopar catalogs LA small-block timing chains and sprockets separately from later engine families, supporting exact application and part identification.↗