New How-To: Install Spark Plugs 850/S70/V70/C70

Post by **matthew1** » 13 Jun 2004, 23:18

Many thanks to Ajay for his very well done how-to on installing spark plugs!
Super pictures Ajay

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The only thing I'd add is on step 7, when you're threading the new plugs in, is to use quarter-inch or eighth-inch rubber tubing to suspend the plugs over the plug holes, then twist the plugs onto the engine block's threads by turning the other end of the tubing. With the tubing, you can't get enough torque to crossthread.

With aluminum blocks like our 850s have, cross-threading spark plugs is easy, and is a big problem if it happens.

Sorry it took a while to get this up

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Spark Plug Change Tutorial: Volvo 850, S70, V70, XC70, C70

adrian · Post by **adrian** » 16 Jul 2004, 11:18

Does enybody know if I need new plugs for my car(volvo 850)94?
I just bought it and is runing little raugh on park or stop /neutral.The vibration and the stearing weel is not normal>After i reach 20mph or 1500rpm it getting better...Is this rugh this car year engine suposed to run?
i cleaned air/tintake /flame arester huses and still rugh.The engine mounts looks good.
second why the abs light came on after I cleared the code on A3 ?how you reset abs light?
Thanks Adrian

White850Turbo · Post by **White850Turbo** » 22 Jul 2004, 14:13

When I got my 850, it was doing the exact thing you described. I put new NGK Iridium plugs in, new distributor cap and rotor, along with new spark plug wires. It runs much much smoother now. A thing to keep in mind when you're changing the plugs is to make sure you get a very good angle on the torx bolt on the side closest to the firewall, near the intercooler pipe. Whoever had done my plugs before, nearly stripped that one bolt out, which made its removal a big headache.

bubba_gump · Post by **bubba_gump** » 04 Sep 2004, 18:32

Good article, but note that on a 2000 or later model you will need 1 more tool: a 10 mm socket to remove each spark plug boot, which is held down by 1 bolt each. a bit of a pain, but oh well.

volvoloser · Post by **volvoloser** » 14 Oct 2004, 19:57

Your instructions say to hand tighten the plugs. Is that all that is required? Seems unreasonable to me, but if you say its so it must be so.
Volvo newbie

Post by **matthew1** » 14 Oct 2004, 23:40

If it's threading them you're talking about, I wholeheartedly recommend the rubber tube method. It virtually eliminates the possibility of crossthreading.

After you thread them:
you can't really hand tighten them -- you need a socket to turn them at all. Go to "on" plus 1/4 turn.

satchmodog9 · Post by **satchmodog9** » 18 Sep 2005, 21:03

One thing about the aluminum heads ;slowly back the plugs out and screw them in a bit. Do not just take them out, slowly loosen a bit and tighten a bit until you get it all the way out. Never do this change to a hot head. You will damage the threads for sure.

zomaster · Post by **zomaster** » 24 Nov 2005, 19:37

Step 7
Install the new plug. Hand tighten it a "sufficient" amount.

18 ft-lbs

your guides are helpful, if only i found this site before i did most of these jobs already

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zeek · Post by **zeek** » 10 Oct 2006, 16:46

Dear Ajay

On my V70 XC there is a 2 inch diameter plastic tube running across the engine. It covers two of the T screws that must be taken out to remove the plug cover. Could you elaborate on how this should be done.

Thanks

bobsnow100 · Post by **bobsnow100** » 10 Oct 2006, 18:14

If you get a 5/8" spark plug socket,(especially for spark plugs), it should have a rubber boot in it which HOLDS the spark plug so you can get it out and also to help thread it in. I put a 6" extension on the spark plug socket and then you don't need the rubber tube. Once you have them threaded in you torque them to 18 ft. lbs. I always put anti seize compound on the threads. Gap is .028