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bslide
04-24-2012, 10:41 AM
I have a 05 xlv with the 340 Indmar. I have about 300hrs on it and it looks like the plugs, wires, cap and rotor are stock. Any one know the part numbers for the cap, rotor, and wires? It also appears that I have to take the exhaust manifolds off to get at 2 of the spark plugs?

MOOMBA_97
04-24-2012, 11:01 AM
Call Discount Inboard Marine. Tell them what you have and they will get you the right parts. Those guys are some of the best to deal with.

Hoopskier
04-24-2012, 01:15 PM
I don't have info to help with your parts search. I wouldn't think that you would have to take an exhaust manifold off to remove some spark plugs. I thought the v-drive compartments had dividers that could be removed for access to tight areas.

sandm
04-24-2012, 01:59 PM
'06 with the 340 ext. you don't have to take the manifolds off, but it helps to have a swivel and an extension on your socket. carefully take them out and watch for crossthreading as you are putting them back in. iirc, 2 of them are somewhat difficult to get to without lowering the dividers and hunching on your side in the lockers. I broke a spark plug wire on my first plug change with one of them on the back(front) of the motor closest to the transom..

seems that you have to use the spark plug socket(and it needs to be a real thin one) to loosen the plugs then take it off and do the rest by hand. with the socket still on the plug, it won't thread out enough to clear the ex. mani.. again, all iirc. been several months since I fogged her...

oh ya, forgot, I bought plug wires off ebay for around $25/set. same factory indmar wires that were on the engine new. plugs have been swapped out several times from autozone for standard efi 5.7sbc plugs. no help on the cap as i have not replaced it yet..

NCSUmoomba
04-24-2012, 02:09 PM
The part numbers should be in the owners manual.

DOCDRS
04-24-2012, 06:10 PM
300 hours is not a lot of hours. I would think everything except the plugs are fine. I would recommend changing the plugs more frequently than the 300 hr mark. 100 hrs is recommended

rdlangston13
04-24-2012, 09:40 PM
100 hrs on spark plugs is insane. on cars the interval is 100,000 miles....

i swap mine out on the boat once a year after i burn off the fogging oil just because i dont want to have a misfire from the fogging oil fouling a plug but not because of hours.

jmb
04-24-2012, 10:03 PM
Skidm will get you what you need. Thats where I got my tune-up stuff from

sandm
04-25-2012, 09:14 AM
100 hrs on spark plugs is insane. on cars the interval is 100,000 miles....



on cars, the interval is 100k when using the right plugs. not all plugs are designed to go 100k miles and the ones that are can be quite expensive.

zabooda
04-25-2012, 12:05 PM
'06 with the 340 ext. you don't have to take the manifolds off, but it helps to have a swivel and an extension on your socket. carefully take them out and watch for crossthreading as you are putting them back in. iirc, 2 of them are somewhat difficult to get to without lowering the dividers and hunching on your side in the lockers. ..

One of the few reasons I like the DD.

NCSUmoomba
04-25-2012, 12:47 PM
We all need to remember that an engine running in boat and one in a car are in different situations. Cars can coast, and run 1500-2000 RPM average? Boats are basically always running "uphill" all the time, and running at higher RPM usually. Imagine if your car or truck drove up a steep hill all the time, how much more wear would be on the engine and its parts.

rdlangston13
04-25-2012, 02:05 PM
I know the loads are different but not so much so to require a 100 hr spark plug life. 100,000 miles on a car is about 3,333 hours on one set of plugs. I think some boat plugs could easily last 500 hours.


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rdlangston13
04-25-2012, 02:05 PM
I may be wrong tho but that is just my opinion


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DOCDRS
04-25-2012, 08:17 PM
Those could be 7 year old plugs and it sounds like they may have never been removed.... A recipe for a frozen and subsequently broken plug during removal and then you would be wishing you spent the $50 and replaced them after 3 years.