1. Mercruiser Thunderbolt Ignition
2. Mercruiser Thunderbolt Ignition Manual Parts
3. Mercruiser Thunderbolt Ignition Manual Transmission
4. Mercruiser Thunderbolt Ignition Manual Diagram
5. Mercruiser Thunderbolt Ignition Manual Pdf
6. Mercruiser Parts

DOWNLOAD MerCruiser Repair Manual 1963-2008 Models. December 14, 2015 Repair Manual MerCruiser Repair Manuals 21. Download a copy of a repair manual for your MerCruiser straight to your computer in seconds—fix you engine or sterndrive now. A downloadable MerCruiser repair manual is a digitally delivered book of instructions that guides the. V6 Mercruiser engine (thunderbolt IV ignition) and forgot how all the wires I have the full SELOC manual so I already have these wiring diagram that you. Replacement Thunderbolt IV ignition control modules (ICMs) no longer come with the Product Diagrams + Systems FWC Kits Cylinder Heads Drive Couplers Electrical Ignition All.

IMPORTANT: Failure to follow these timing procedure instructions will result in improper timing causing performance problems and possible severe damage to marine engines.

1. Mercruiser Thunderbolt Ignition Manual Transmission; Page 27: Ignition Timing SERVICE MANUAL NUMBER 25 MAINTENANCE 7. While holding adjustment stud at the correct belt tension, tighten 5/8 in. Run engine for a short period of time and recheck belt adjustment. Locking Nut 5/16 in. Adjusting Stud Ignition Timing Thunderbolt V Models 1.
2. This item Mercruiser Thunderbolt Ignition Coil 4.3 5.0 5.7 305 350 V6 V8 Mercury Marine. Quicksilver Ignition Coil 8M0079202 - Thunderbolt - for V-6 and V-8 MerCruiser Stern Drive and Inboard Engines Made by General Motors with Thunderbolt IV and V Ignition System.
3. V6 and V8 Carbureted Models (Thunderbolt V Ignition) 1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power supply leads, if applicable, on light to 12 volt battery. Refer to Specifications – “Engine Rotation and Firing Order” for cylinder numbering and location. Connect a shop tachometer to engine.

3.0L Models Only

1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power supply leads on light to 12 volt battery. Refer to Specifications – “Engine Rotation and Firing Order,” for cylinder numbering and location.

2. Connect a shop tachometer to engine.

NOTE: Before starting engine make sure the timing tab and mark on damper are clean. Chalk or white paint on timing mark on damper may help visibility.

3. Install a jumper wire between the two WHITE leads on the distributor. Use Quicksilver 91-818812A1, or fabricate a jumper wire using a 6 in. (150 mm) section of 16 gauge wire with two male bullet terminal ends connected.

4. Bypass the shift interrupt switch, as follows:

A Disconnect wires at shift interrupt switch.

B Temporarily join the engine harness wires together.

IMPORTANT: Do not fail to reconnect these two wires to the shift interrupt switch when timing procedures are complete.

5. Start engine and run at normal idle speed.

6. Aim timing light at timing tab, located on the timing gear cover and crankshaft torsional damper. Check the timing. Refer to “Specifications”.

7. Adjust timing by loosening distributor clamp and rotating distributor body as required until timing mark on damper or pulley lines up with the mark on tab specified in “Specifications.” Tighten clamp and recheck location of timing mark.

8. Aim timing light at timing tab and recheck location of timing mark. Repeat Step 7 until timing is correct.

9. Stop the engine. Torque distributor hold down bolt to 20 lb. ft. (27 N.m).

10. Reconnect the two wires to the shift interrupt switch.

IMPORTANT: Be sure to remove jumper wire before returning engine to service, otherwise timing will not advance.
11. Remove jumper wire at distributor white leads.

12. With timing light still connected, start the engine and run at IDLE. Verify that timing did advance to 12o BTDC, plus or minus 2o. At 2400-2800 RPM maximum (total) advance is obtained and should be 27o BTDC (plus or minus 2o).

13. Stop the engine and remove the timing light.

V6 and V8 Carbureted Models (Thunderbolt V Ignition)

1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power supply leads, if applicable, on light to 12 volt battery. Refer to Specifications – “Engine Rotation and Firing Order” for cylinder numbering and location.
2. Connect a shop tachometer to engine.
3. Using a jumper wire, connect the ignition system timing lead (PUR/WHT wire) to a good engine ground (-). This locks the ignition module into the “Base Timing Mode”.

NOTE: Before starting engine make sure the timing tab and marks on damper are clean. Chalk or white paint on timing marks may help visibility.

4. Start engine and run at normal idle speed. Allow engine to reach normal operating temperature.
5. Aim timing light at timing tab, located on the timing gear cover and crankshaft torsional damper.
6. If adjustment is required, adjust timing by loosening distributor clamp and rotating distributor body as required until timing mark on damper or pulley lines up with the mark on tab specified in “Specifications”. Tighten clamp and recheck location of timing mark.
7. Make sure that the distributor has been tightened. Remove the jumper wire from the timing terminal.
8. Remove jumper wire between the timing lead (PUR/WHT wire) and ground (-).

IMPORTANT: Be sure to disconnect the jumper wire from between the ignition system timing lead and ground (-) before attempting to resume normal operations. If the jumper wire is left in place, the ignition module will operate in the “Base Timing Mode”. This means that the additional timing advance features would not function.

9. Stop engine and remove timing light.

V6 and V8 EFI Models (EFI Ignition)

Two items of test equipment are required: an inductive pickup timing light and one of either a Scan Tool, Marine Diagnostic Code Tool or MerCruiser Special Timing Tool (Quicksilver 91-805747A1).
1. Connect timing light (91-99379 or similar) to No. 1 spark plug wire. Connect power supply leads, if applicable, on light to 12 volt battery. Refer to Specifications – “Engine Rotation and Firing Order,” for cylinder numbering and location.
2. Connect a shop tachometer to engine.

NOTE: Before starting engine make sure the timing tab and mark, or marks, on crankshaft damper are clean. Chalk or white paint on timing marks may help visibility.

NOTE: If NOT Using MerCruiser Timing Tool: With engine running, set the scan tool or Marine Diagnostic Code Tool to the SERVICE MODE and follow manufacturer’s instructions. On 350 Mag MPI Model, engine RPM will automatically increase to a higher RPM. You do not have to increase it manually, as stated in the following steps.

3. Connect the Timing Tool (or appropriate tool, as listed above) to the DLC connector (in the electrical box or on the electrical bracket) of the wiring harness.
4. Start the engine. Allow it to reach normal operating temperature.
5. On all models except 350 Mag MPI: Manually adjust the engine throttle to 1800 RPM.
6. Aim timing light at timing tab, located on the timing gear cover and crankshaft torsional damper. Check the timing. Refer to “Specifications.”
7. Loosen the distributor clamp bolt enough to just be able to rotate the distributor with some resistance.
8. Aim timing light at timing tab and recheck location of timing mark. Slowly rotate the distributor clockwise or counterclockwise to adjust the timing to specified degrees.
9. Aim timing light at timing tab and recheck location of timing mark. Repeat Step 8 until timing is correct. Torque distributor hold down bolt to 30 lb. ft. (40 N.m).
10. Manually close the throttle to bring engine RPM back to idle.

IMPORTANT: Be sure to disconnect MerCruiser Special Timing Tool from the DLC connector, or set the tool to NORMAL MODE if using the Scan Tool or Marine Diagnostic Code Tool, before attempting to resume normal operations. If the MerCruiser Special Timing Tool is left in pace or the setting of the tool remains in SERVICE MODE, the ignition system will operate only in the “Service Mode”. This means that the additional timing advance features would not function.

11. Disconnect the MerCruiser Special Timing Tool from the DLC connector. If using the Scan Tool or Marine Diagnostic Code Tool, set the tool to NORMAL MODE. Disconnect the tool.
12. Stop the engine. Turn ignition key to OFF position.
13. Remove timing light.

Mercruiser Thunderbolt Ignition

MERCRUISER PART DIAGRAMS

Section 4B - Thunderbolt V Ignition System. Table of . Electrical, ignition and fuel system components on your MerCruiser power package cautions, along with others listed throughout this manual, that you should observe.

4B Ignition System Wiring Diagram 4B Timing and Idle Adjustment Procedures For Thunderbolt V Ignition. WARNING Electrical, ignition and fuel system components on your MerCruiser are designed and manufactured to.

Mercruiser Thunderbolt Ignition Manual Parts

Im looking to replace the thunderbolt V ignition system. wanted to replace the mercruiser ignition system with something new.

Mercruiser Thunderbolt Ignition Manual Transmission

Off of the engine mounted wire harness there are 2 grey wires with small eye connectors.. elec diagram.

What I've done so far: checked all ignition wiring for shorts, The troubleshooting chart for the ICM in the Merc manual doesn't help much. 4B Ignition System Wiring Diagram.

4B Troubleshooting Thunderbolt V Ignition. 4B on your MerCruiser are designed and manufac- tured to.Thunderbolt v ignition wiring diagram together with subaru robin parts diagrams further wiring harness electrical thunderbolt v ignition also moreover mercruiser thunderbolt 4 wiring diagram also mercruiser wiring diagram moreover mercruiser wiring diagram along with cruiser 5 7 thunderbolt wiring diagram further mercruiser.

ELECTRICAL SYSTEMS WIRING DIAGRAMS.

4F-0 - WIRING DIAGRAMS Table of Contents WIRING DIAGRAMS - 4F-1 Wiring Colors for MerCruiser NOTE: Color codes listed below DO NOT apply to fuel injection system harnesses. WIRING DIAGRAMS - 4F-3 THUNDERBOLT IV WITH IGNITION MODULE MOUNTED ON. Thunderbolt v ignition w/o knock sensor.

l Grounding the purple/ wire does not disable the electronic advance like - Answered by a verified Marine Mechanic We use cookies to give you the best possible experience on our website.

Mercruiser Thunderbolt Ignition Manual Diagram

Jun 19, · Need wiring schematic for mercruiser with thunderbolt IV 4 ignition. OK, putting everything back together and something isn't right.

This older thread has a link to a diagram. This is how mine was wired except that my module was the black box style, one detail; the 2 different thunderbolt IV boxes use same wiring. small one has.

Mercruiser Thunderbolt Ignition Manual Pdf

Mercruiser Thunderbolt Ignition Wiring Diagram ~ This is images about mercruiser thunderbolt ignition wiring diagram posted by Peggy G. Brown in Mercruiser category on Nov 12, You can also find other images like wiring diagram, parts diagram, replacement parts, electrical diagram, repair manuals, engine diagram, engine scheme, wiring.Mercruiser Thunderbolt IV no power to coil Page: 1 - iboats Boating Forums | Mercruiser Thunderbolt Ignition Wiring Diagram.

Mercruiser Parts

Mercruiser. Free Download Images Wiring Diagram