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paul_rodgers

Regular Contributor
I am not sure how I am supposed to time this engine, 454 7.4 litre gen 6 L29 engine. The book tells me to set to service mode and on a L29 7.4 the RPM's will increase to around 1200 rpm's. That being said do I set it to 8 degrees BTDC as it reads?? Help
 
justintime

Could you either delete your saying and link or make it a much smaller font? It is very confusing and will make newbies click the link............

Thanks


:eek:HUMAN BUILT = HUMAN FIXED:D

CERTIFIED MARINE TECHNICIAN

WWW.SWITCHBAIT.COM​
 
The engine must be at NORMAL OPERATING TEMPERATURE for this adjustment. Two
items of test equipment are required: an inductive pickup timing light and either a Scan Tool,
Diagnostic Code Tool, or MerCruiser Special Timing Tool (91-805747A1).

1. Connect timing light to number 1 ignition wire.

2. Connect the appropriate tool to the DLC connector of the wiring harness.

NOTE: The 7.4L MPI will automatically adjust engine to approximately 1200 - 1500 rpm
when put in the service or timing mode.

3. Manually adjust the engine throttle to 1800 rpm + 200.

4. If Not Using MerCruiser Timing Tool: With engine running, set the scan tool or Diagnostic
Code Tool to service mode.

5. Shine the timing light at the timing mark indicator located on the timing chain cover.

NOTE: If adjustment is needed, loosen the distributor hold-down bolt and rotate the
distributor clockwise or counterclockwise to adjust the timing. Then repeat the timing light
check until the specification (8 degrees BTDC) is met.

6. Torque distributor hold-down bolt to 30 lb-ft (40 Nm).

7. Set Scan Tool or Diagnostic Code Tool to normal mode. If using the MerCruiser Special
Timing Tool, disconnect it from DLC connector.

8. Manually close throttle to bring engine down to idle state.


you can do this with a paper clip, short a and b together
 
Thanks guys, what I really needed to know was after you set to service mode it goes to 1200-1500 rpm's at that point do you set to 8 degrees BTDC?
 
Hi guys just an update, Got motor timed and everything went according to plan, tomorrow is water trials after timing, Might get some fishing in I hope.. A big thanks to everyone on here that helped..
 
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