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6) is there a book or website with all the torque details for Mercedes by year?
7) can you recommend a torque wrench?
I have two torque wrenches, but I'm unsure if they are accurate! 8) What code scanning toll do you recommend?
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I will also purchase a WERA Click-Torque A5 Torque wrench Drive 2 5-25 Nm.
A set of E-TORX Socket Set and, finally a spark plug wire removal toll
Is there any other toll you recommend or need?The Mercedes dealer gave me a price of $900 for replacing the spark plugs, so I will try to do it myself. I will start on the air filter size because I learned that the driver size is a bit harder and If I can finish it, I will take it to the mechanic to do the drivers size.
Tim,
Thanks for noticing the information on the site; most sites do not post any information on their products, and I missed it.
Most of the YouTube videos I saw say that the spark plug should be torque at 23nm, 17 ft-lbs = 23nm, this is why I need some clarification on the torque.
Great. I see that I need a 14mm bi-hex for the Bosh spark plugs. I'm assuming the Mercedes spark plugs should use the same 14mm bi-hex.?
Yeah, many torque wrenches are inaccurate. I read the snap-on, and Wera torque wrenches have a minimal margin of error.
I own a park $55 PRO BIKE TOOL 1/4 Torque Wrench and a EPAuto 3/8-Inch Drive Click Torque Wrench 10-80, but I don't feel they are accurate for their price.
Thanks!
Originally Posted by TimC300
In the Bosch link you posted click on the product specifications. Says 14mm bi-hex. Torque 11-15ft lbs.
Wow you are going all out on the torque wrench. I bought mine at Harbor Freight on sale for $13.
I've seen some pretty complementary write-ups on the Harbor Freight torque wrenches, FWIW. The only knock I had on mine (I have a couple) is that the clicks on the 1/4" is pretty subtle at very low torque (like the valve cover bolts on my E61 BMW, for example).
And there's no reason to replace the coils - they'll all outlast the car, and will work 100.000% as good as a new one. So many people "upgrade" with some new off-brand coils and open up themselves to the coils actually failing or acting odd.
I had good luck with an Autophix stand-alone scanner - cost around $100, but I'm not sure they're still on the market (don't think I could find them last time I tried to search on Amazon, for example)... maybe Ancel is a good option?
Thank you, I will change the plugs and keep the coils. There are so many code scanners on Amazon that it gets confusing. The Ancel 2024 looks good; I will see if anyone else has a note recommendation.
The Harbor Freight torque wrenches look like a good value, but according to this video, you can't trust it under 100lb torque. The Pro Bike Tool torque wrenches score very high.
I may get a new one or use what I have.
Thanks fo the help.
Originally Posted by habbyguy
I've seen some pretty complementary write-ups on the Harbor Freight torque wrenches, FWIW. The only knock I had on mine (I have a couple) is that the clicks on the 1/4" is pretty subtle at very low torque (like the valve cover bolts on my E61 BMW, for example).
And there's no reason to replace the coils - they'll all outlast the car, and will work 100.000% as good as a new one. So many people "upgrade" with some new off-brand coils and open up themselves to the coils actually failing or acting odd.
I had good luck with an Autophix stand-alone scanner - cost around $100, but I'm not sure they're still on the market (don't think I could find them last time I tried to search on Amazon, for example)... maybe Ancel is a good option?
You need to replace the plug Boots, or it’s likely a few will not fire . Coils will be ok to leave. But those plugs last about 100,000m . I replaced mine at 75,000 and it was not needed. Iridium plugs really last. Do not gap the plugs they are pre gapped . They are to easy to damage .
According to the Mercedes user manual the spark plugs should be changed at 50K? I guess they can go to 100K
Ok, I will replace the plug boots. About the spark plug gaps, according to the video below, the gap should be .032, the spark plug torque 32Nm, and the coil torque at 9nm. and the BOSH site says the gap is .028" (0.7mm).
1) What torque should I use on the spark plugs and ignition coil screws?
2) What should the spark plug gap be? I know that manufacturers send them ready to install, but I would like to check the gap
Thanks!
spark plug
Originally Posted by Mmr1
You need to replace the plug Boots, or it’s likely a few will not fire . Coils will be ok to leave. But those plugs last about 100,000m . I replaced mine at 75,000 and it was not needed. Iridium plugs really last. Do not gap the plugs they are pre gapped . They are to easy to damage .
What year do you have ? The issue is what type of plug you have in there now. The old fashioned regular plug maybe 40,000, then there is Platinum, those go longer . Iridium which my 13 had go over 100,000. Take one out and look at it. But have a new plug boot to reinstall it. Post a photo of the plug tip . And look up ( reading spark plug condition) this will give you a real insight to how you motor is running . If you want to know more do a compression test on that one cilinder to get an idea of life left. My new plugs at 75000 made No improvement , the old ones looked good. The 13 says replace at 60,000. More important would be transmission fluid change , brake fluid change and activate the ABS while doing it . The Cooling system fluid . And differentials . Your belts and hoses are old . Brake fluid is always overlooked.
My W204 needs the plugs changed now at 160,000 miles so im planning everything. My operators manual says every 80,000 miles and calls for non-resistor type plugs and I cant find them anywhere. Im going to try the MB dealer to see if they are in fact non-resistor type. The dealer lists the plugs at $15 each which isnt bad, but if they are just going to give me Bosch resistor type ill buy at FCP instead cheaper. The plugs for my M272 engine are 16mm 12 point, just bought a thin walled magnetic socket on Amazon for $4.99.
The Mercedes instructions I have for those plugs say 23nm, though on the NGK website for the plugs that fit my engine says10-15nm torque. But then on the FCP website it says 23nm for the Bosch plugs in the listing. Im going to go with 23nm.
Im just replacing the plugs. I dont see a need to replace anything else at the moment. I have a Foxwell NT530 obd scanner that I scan the car with occasionally just for fun. Seems like a good scanner, though havent really needed to use it for a problem.
Listing the engine would be helpful, no idea which engine you have. vin would be even better, or post your submodel 204.???.
As for maintenance I look in the Maintenance manual that came with the car and I follow that, at a minimum. If you want to do things more frequently then great. No harm in changing the spark plugs earlier. if you want to replace other stuff while your at it I see no harm in it, but I dont see it necessary.
For gap and torque follow either the manufacturer OR the Mercedes WIS for your engine.
As a former aircraft mechanic, I had to have my torque wrenches calibrated every year. I think Craftsman torque wrenches are a very good value. I have a 55 year old Craftsman 1/2" drive 150 lb-ft, a 25 year old Craftsman 3/8" 250 in-lb, and a 1/4" drive 150 in-lb Utica I got at a flea market. They all checked good every time.
I would not pay $180 for a torque wrench made in China and I wouldn't trust a torque wrench that only cost $13. As an experiment I once sent a cheap torque wrench from Northern Hydraulics to be calibrated and it couldn't be done.
I just looked and in my Operators Manual in the glove box it states the replacement spark plug, the tightening torque and the gap. But i have the M272 engine.
I'm comfortable with the inexpensive torque wrenches, just something for me to confirm im in the ballpark of how tight it should be. I would love a good one that is 100% accurate but just not worth the expense, I need the money for all the used Mercedes parts I have to buy to keep the car running.
I originally got the 1/2" drive for my wheel bolts. I finally bought myself a cordless impact wrench and it wouldnt take the wheel bolts off, I was bummed thinking its junk. Bought the torque wrench and realized I was cranking the wheel bolts down way too tight using a breaker bar. Now I torque them down and the impact can remove them.
I have a 2015. Thank you. Maybe I need to find a Mercedes mechanic and pay him to tell me the secret Nm torque for 2015!
The Bosh site says that the torque specs Cast iron is 11-18 lb. ft. aluminum is 11-15 lb. ft.
Does the GLK have an aluminum engine? If I convert the 15 lb to Nm, I get 20NM.
I have a 2015. Thank you. Maybe I need to find a Mercedes mechanic and pay him to tell me the secret Nm torque for 2015! The Bosh site says that the torque specs Cast iron is 11-18 lb. ft. aluminum is 11-15 lb. ft. Does the GLK have an aluminum engine? If I convert the 15 lb to Nm, I get 20NM.
Originally Posted by Mmr1
What year do you have ? The issue is what type of plug you have in there now. The old fashioned regular plug maybe 40,000, then there is Platinum, those go longer . Iridium which my 13 had go over 100,000. Take one out and look at it. But have a new plug boot to reinstall it. Post a photo of the plug tip . And look up ( reading spark plug condition) this will give you a real insight to how you motor is running . If you want to know more do a compression test on that one cilinder to get an idea of life left. My new plugs at 75000 made No improvement , the old ones looked good. The 13 says replace at 60,000. More important would be transmission fluid change , brake fluid change and activate the ABS while doing it . The Cooling system fluid . And differentials . Your belts and hoses are old . Brake fluid is always overlooked.
What Mercedes instructions do you have? where can I get them?
Originally Posted by TimC300
My W204 needs the plugs changed now at 160,000 miles so im planning everything. My operators manual says every 80,000 miles and calls for non-resistor type plugs and I cant find them anywhere. Im going to try the MB dealer to see if they are in fact non-resistor type. The dealer lists the plugs at $15 each which isnt bad, but if they are just going to give me Bosch resistor type ill buy at FCP instead cheaper. The plugs for my M272 engine are 16mm 12 point, just bought a thin walled magnetic socket on Amazon for $4.99.
The Mercedes instructions I have for those plugs say 23nm, though on the NGK website for the plugs that fit my engine says10-15nm torque. But then on the FCP website it says 23nm for the Bosch plugs in the listing. Im going to go with 23nm.
Im just replacing the plugs. I dont see a need to replace anything else at the moment. I have a Foxwell NT530 obd scanner that I scan the car with occasionally just for fun. Seems like a good scanner, though havent really needed to use it for a problem.
Thanks, Tim,
I thought I only needed to post the year and model to get the info. It is a 2015 HLK 350 gasoline, formatic.
What maintenance manual are you referring to? the one that comes with the car? That maintenance manual says that I should replace the spark plugs at 50K miles?
Or are you referring to another maintenance manual? In my first post, I stated that I was looking for a service book or something similar.
Where can I find the manufacturer of my engine or the Mercedes WIS?
Originally Posted by TimC300
Listing the engine would be helpful, no idea which engine you have. vin would be even better, or post your submodel 204.???.
As for maintenance I look in the Maintenance manual that came with the car and I follow that, at a minimum. If you want to do things more frequently then great. No harm in changing the spark plugs earlier. if you want to replace other stuff while your at it I see no harm in it, but I dont see it necessary.
For gap and torque follow either the manufacturer OR the Mercedes WIS for your engine.
Thanks, Tim; I think the 2015 GLK 350 is an X204.
My car has the wrong operation manual; it has a CLS operations manual.
I checked the online manual, and I don't see any information about sparkplugs or gaps! Link below.
I think the torque at 23nm is correct. I checked everywhere, even chat GPT, and got the same results!
I just looked and in my Operators Manual in the glove box it states the replacement spark plug, the tightening torque and the gap. But i have the M272 engine.
It is interesting that when you select a single spark plug, you can see the torque information. However, if you select a kit, the torque information is not available.
I'm glad you found the info Tim! But I don't see the torque information for the Ignition Coil. CHat GPT says it should be around 9-10 Nm (Newton meters) fo the coil bolts!
Originally Posted by TimC300
I just looked and in my Operators Manual in the glove box it states the replacement spark plug, the tightening torque and the gap. But i have the M272 engine.
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