Spark plug wires

Sman0624

Sman0624

New Member
Sep 30, 2008
26
Macomb, Michigan
Boat Info
1997 215 Express Cruiser
Engines
5.7L EFI
Can anyone advise if there is a cross reference Sierra spark plug wire set that matches with Mercury 84-816608Q70?
The engine is a 1997 5.7L EFI TB, serial number 0K163473. Ignition is Delco HEI not Thunderbolt.

I found a Sierra part 18-8836 that matches with a Merc 84-81660BQ71 but I can't find anything for the Q70..if that even matters.

http://www.iboats.com/Mercruiser_Pr...2799674--session_id.105543706--view_id.269815

I was hoping to save a little money and get the wires on iboats.com but if not than I'll get the Merc part number.
Thanks,
David
 
Thanks for the quick replyand the link.
I initially went to West Marine here and they were trying to get me to commit to the Sierra parts however they couldn't tell me what part number that's why I checked out iboats. However, I agree with you..I'm going with Mercury parts per the link you posted.
Thanks again!
 
If you have a genuine HEI, then it's not USCG approved since the vents are not screened. I do know of this since I installed an HEI as well. Awesome addition for efficiency from a better ignition advance curve.

That having been said, get your wires from Jeg's or Summit racing. Better suppression and higher heat resistance . Instant pricing and shipping.

Mercruiser OEM's are able to be improved upon.
 
Dirtguy said:
If you have a genuine HEI, then it's not USCG approved since the vents are not screened. I do know of this since I installed an HEI as well. Awesome addition for efficiency from a better ignition advance curve.
Click to expand...

Might be a good time for you both to read over your insurance policy for a disclaimer related to non USCG approved propulsion equipment. Some companies are damn picky what is down in the bilge....
 
Stray Cat said:
Might be a good time for you both to read over your insurance policy for a disclaimer related to non USCG approved propulsion equipment. Some companies are damn picky what is down in the bilge....
Click to expand...


The boat has not been modified. It's factory equipment. Engine serial number 0K163473 shows a Delco HEI system and components. >> http://www.mercruiserparts.com/Show...=80&bdesc=DISTRIBUTOR+AND+IGNITION+COMPONENTS

I can't believe that it wouldn't be USCG approved.
 
Sman0624,
Don't panic. It's a terminology mistake.

"H.E.I." was technically a trade term for the older large cap, Delco ignition system with the coil in the cap. That was the one I was referring to. Mine has been "marinized" with stainless screens and vents.

Any and almost all equipment can be "marinized" to spec. There is alot of aftermarket equipment that can be safely installed and is USCG approved. It's just not production.

The one in the diagram is an electronic ignition system but not the large cap, large spark plug gap, high capacity one I was referring to. Good system, but not at all adjustable. Other than base timing.

dg
 
Stray Cat said:
Might be a good time for you both to read over your insurance policy for a disclaimer related to non USCG approved propulsion equipment. Some companies are damn picky what is down in the bilge....
Click to expand...

If you are unlucky enough to have an "event," having everything USCG approved doesn't guarantee coverage. You can't insure against negligence.

If your repairs aren't done by a certified accredited Merc technician might void the policy as well. The local marine mechanic with 30 yrs experience won't do.

dg
 
Dirtguy said:
If you are unlucky enough to have an "event," having everything USCG approved doesn't guarantee coverage. You can't insure against negligence.

If your repairs aren't done by a certified accredited Merc technician might void the policy as well. The local marine mechanic with 30 yrs experience won't do.

dg
Click to expand...

dg - I'm not suggesting guarenteed coverage on anything, however negligence or disregard for materials used in a gas marine engine environment will likely be discovered during an insurance / marine investigation after an "event". If said component was the cause of the loss, may the pissin contest begin between the insured and the insurance company. Not a place where I want to find myself.

I also went to the Jegs home page as you advised, I didn't see any links for aftermarket marine parts. Are you suggesting Sman0624 use performance automotive ignition wires for his gas marine application? Maybe I just missed the marine link...
 
There is no "Marine" link. The wires used in the automotive arena are identical to the ones used in the marine market. Maybe even better with solid brass ends vs. just plated steel. And they have better insulation qualities with higher temp jackets and high temp boots/ends. In most cases, they're even cheaper. But if you're not sure, then continue to pay the higher price for a lesser product.

I've worked in the powertrain area with Mercury Marine and Mercruiser on our lakes here in AZ during the winter. My experience is in keeping their stuff running, with them. They're the same wires as production automotive wires. Most of the ignition components are modified automotive components. Injectors, sensors, wire, terminals are all auto components marinized.

dg
 
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