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Rick E. (aka RicardoMarine) Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
You have thrunderbolt Vs in that boat depicted. Thats those thingies mounted on the inside of the port side exhaust manifolds. Don't even think about trying to "power time" it.
Thr T-bolt V is a very complicated microprocessor based ignition/timing system. This allows 250 HP out of a 2 BBL carb, where it was 220 HP with the t-bolt V. There is also a comperable fuel saving at all RPMs.
The procedure is:
1. Buy a manual before screwing with the engine. Improper setting can burn a hole thru the piston tops.
2. Disable the knock sensor by grounding the purple-white wire to the starboard of the carburator.
Set the timing to the spec at idle (650RPM). Remove ground, Do not screw with the timing, as the knock module compensates for all conditions, 6 times a second.
No personal attack intended, but I have seen an engine where the owner tried to outsmart the microprocesser. The timing went way high, and burned completely thru #4, #7, and #8 pistons in a 2 hour run. He had to get a new long block.
Captharv 2001 2452
"When the draft of your boat exceeds the depth of water, you are aground"
I agree with Harv. Set BASE or Initial, and let the system do what it's suppose to do.
However, this does not prevent you from looking and checking to see where the progressive and TA are..... and I suppose that's why you asked for an advance curve!
Now.... perhaps someone changed this from the Merc TB system. For this, we'd need a few good photos of the ignition distributors.
Or.... you pull a distributor cap and see if you can rotate the rotor.
If it rotates approximately 10*, you'll have a mechanical advance system that was changed out by someone.
If it acts ridged and does not rotate, then you have an EST system...... (i.e., the Merc TB, or Delco, or ????)
.
Rick E. (aka RicardoMarine) Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
i just installed a new coil,dist cap,rotor and plugs last night my motor idles way better now.IM still confused about which
ignition i have though.Captharv says T-BOLT 5 . QUOTE BY Captharv..
" Thr T-bolt V is a very complicated microprocessor based ignition/timing system. This allows 250 HP out of a 2 BBL carb, where it was 220 HP with the t-bolt V " This sentace does not make sense to me, it says T-BOLT V twice
i just got off the phone with the merc dealership and they said because the module is mounted on the side of the riser its a T-BOLT 4
i really need to know which one it is because they are two different base timing set ups.
i really dont want to doubt anyone on this board but i am getting coflicting information
i have attatched a older pic of my motor where you can see the module better
i really dont want to doubt anyone on this board but i am getting coflicting information
i have attatched a older pic of my motor where you can see the module better
port motor ser# M018153 starb motor ser# M010718
What and who is giving you conficting information?
The controller on your Port side manifold highly suggests the Merc EST...... Merc TB Ignition! (EST = electronic spark timing)
Shosrt of that, the simplest method to know for certain, is to do the following:
2850Bounty wrote:
you pull a distributor cap and see if you can rotate the rotor.
If it rotates approximately 10*, you'll have a mechanical advance system that was changed out by someone.
If it acts ridged and does not rotate, then you have an EST system...... (i.e., the Merc TB, or Delco, or ????)
Rick E. (aka RicardoMarine) Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
I believe that the actual distributor may be the same, but the module should state TB IV or TB V. Yes/No????
Rick E. (aka RicardoMarine) Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
The t-bolt IV has one module on the inside of the port manifold.
The t-bolt V has 2 modules, piggbacked on the inside of the port manifold.
The difference is the above mentioned knock module, which is the smaller of the 2 whbich are piggybacked.
Note: This is a biggie: If your mechanic does not know the difference between a IV and a V ignition, I would not let him touch my boat. Get a merc certified mechanic.
We engineers have a saying: "If you don't know what it does, don't screw with it"
Captharv 2001 2452
"When the draft of your boat exceeds the depth of water, you are aground"
However, according to this page, the TB V knock sensor module is also mounted on the distributor.
Perhaps there are several versions of this whereby the modules are mounted on the manifold.
I agree with Harv. If you are not comfortable in doing this, seek the help of someone who is certified.
.
Rick E. (aka RicardoMarine) Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
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