Re: Timing for Merc MAG 350 MPI
In a previous post I was removing the engine to deal with a cracked block. We removed the engine, performed a pressure test and inspected the block with flourescent dye penetrant. One of the "freeze" plugs was out and another had moved. My mechanic believes the plugs saved the engine and nothing is wrong with it. We are preparing to re-install it in the boat and have everything but the timing. It is a 2007 Mercruiser MAG 350 MPI Horizon and when I looked it up in a manual it states that the timing "is not adjustable". The engine has a distributer and hold down yoke like a "normal" engine so he says it has to be adjustable. Does anyone have any info or ideas on this.
Thanks.
Chas
It is not adjustable because of the crankshaft and camshaft sensors take over the timing.
You will still need to see the service manual for your engine, It will show you how to set the Distributor in the correct way, Below is how a service manual would talk about setting it up with out photos.
You still will need to put the engine cylinder to number one top dead center like normal.
Distributor
Removal
1. Remove all spark plug wires.
2. Remove the two screws fastening the distributor cap to the distributor.
3. Remove the distributor cap and set it aside.
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4. Scribe a line on the distributor housing marking the position of the rotor. Also, mark the
position of the distributor housing on the intake manifold.
5. Remove the bolt retaining the distributor.
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6. Remove the distributor and the gasket from the intake manifold.
IMPORTANT: Do NOT crank the engine over after the distributor has been removed
unless engine is being disassembled. If the engine is disassembled, you will need to
ensure that the engine is at number 1 cylinder TDC before installing the distributor.
Installation
1. If the engine was completely disassembled, verify that the engine is at number 1 cylinder
TDC. Verify that the rotor tang is in the proper location as shown above.
2. If only the distributor was removed, align the rotor, the housing and the intake manifold
using the scribe marks.
3. Slowly lower the distributor (with gasket) through the intake manifold and into position.
If the distributor shaft will not drop into position, turn until it drops into position.
4. Install the hold-down clamp over the distributor and bolt it securely to the engine surface.
Torque the bolt
Distributor Hold Down Clamp 40Nm 30lb-ft
5. Install the distributor cap and secure in place with two torx fasteners.
6. Connect the spark plug wires.
