Merc. 2.5L, 120 HP Timing Pointer Question

[Bizmark]

Here is a picture of the timing pointer on my 1987 Merc. 2.5L engine. I'd like to check the timing now that I have installed a Pertronix Ignitor. It appears to have 6 "peaks" and 5 "valleys"<br /><br />Can I assume that the center "valley" is 0 degrees? And if so, is it 2 degrees from TDC to the first "peak" ?, 4 degrees from TDC to the first "valley" ?, etc?<br /><br />I'm just guessing at this. Any help would be appreciated.<br /><br />Thanks,<br /><br />Biz<br /><br /><br />

 

[Bondo]

Re: Merc. 2.5L, 120 HP Timing Pointer Question

is it 2 degrees from TDC to the first "peak" ?, 4 degrees from TDC to the first "valley" ?, etc?

Yes...... That's Before Top Center.....<br />

Can I assume that the center "valley" is 0 degrees?

No.......<br />It Looks like a Line at the Bottom Valley on Your's.........<br /><br />There's not much use, having ATC marks.....

 

[rodbolt]

Re: Merc. 2.5L, 120 HP Timing Pointer Question

sand the rust off and you will see the marks are numbered<br /> looks like you have a leaking circ pump. use a mirror and check the weep hole under the pump snout. if its all rusty it leaks.<br /> good luck and keep posting but if you continue to neglect your machine like it looks, your next post will be about timing cover replacement.

 

[Bizmark]

Re: Merc. 2.5L, 120 HP Timing Pointer Question

Thanks for the help guys!<br /><br />I found the timing marks with a little steel wool. I guess I thought there wasn't any numbers on the tab, which is why I didn't look closer in the first place.<br /><br />I'll keep an eye on the water pump. Timing cover is also a little rusted. Boat is now fresh water only and spends most of it's time on a trailer, so I hope the cover will last a while longer.<br /><br />Thanks again,<br /><br />Bizmark