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I don't think I phrased my question concise enough. How were you able to get the silicone hose to arc around the WP pulley without making contact? Installing updated hose end to end, the pulley will rub against it.
hey does anyone know if the turbo coolant line parts are the same for m157 and m278
we have a s550 2015 that blew a line in front, and i need to get it fixed.
im looking for a list of parts for the 278 but cant seem to find on the other sections of forum thanks
You need EPC to figure out the exact parts number. I have seen different driver-side coolant line for M278 and M157. I think the passenger side and the bridge line in the middle is the same. The water pump may have different parts numbers but the M157 one is superior. It has closed ports in the middle rather than the open port which needs plastic plug. I think Mercedes revised the design on this one.
I have a brand-new water pump in box, original Mercedes. DM me if you're interested.
Last edited by zk2004mb; Mar 12, 2025 at 01:09 PM.
You need EPC to figure out the exact parts number. I have seen different driver-side coolant line for M278 and M157. I think the passenger side and the bridge line in the middle is the same. The water pump may have different parts numbers but the M157 one is superior. It has closed ports in the middle rather than the open port which needs plastic plug. I think Mercedes revised the design on this one.
I have a brand-new water pump in box, original Mercedes. DM me if you're interested.
Will the 157 pump fit the 278.
My pulley looks good. Tho it's old I don't see it walking.
Trying to keep expense down as it's. A spare car that already has two major issues with bad turbo actuator and also a lot of chatter from the rockers on the top of the head
My pulley looks good. Tho it's old I don't see it walking.
Trying to keep expense down as it's. A spare car that already has two major issues with bad turbo actuator and also a lot of chatter from the rockers on the top of the head
Yes the WP is the same. For some reason M157 pump has a much higher premium, not sure if it used a better bearing or just AMG tax. The WP part number is different and the part number on the bearing wheel is also different. I hope I paid extra dollar for a better product.
For cost wise, if you're doing it yourself you can only swap the damaged parts. If you decide to hire a shop, you better do all the "while you're down there" items because they have so much overlap in labor.
For your reference I just paid a shop to replace water pump, driver side turbo line, thermostat, oil filter housing gasket, oil cooler gasket, belt tensioner, idler pully and belt. End up with $1700 in labor, I supply all the parts.
Last edited by zk2004mb; Mar 12, 2025 at 04:05 PM.
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Originally Posted by kevm14
*****ORIENTATION NOTE: "Left" and "right" ALWAYS, ALWAYS, ALWAYS refers to the position relative to you sitting in the car. Never use "left" or "right" to refer to your perspective when looking at the engine from the front unless you clarify what you mean in each instance. This has been a PSA.****
Unless you're in the UK; then everything is on the wrong side!
I completed this DIY this past weekend. I've read these coolant lines start failing around 60-70k miles so since I've purchased the vehicle less than 6 months ago with 64k miles, the brutal Florida summer wasn't proposition I was willing to entertain. The difference was I elected to replace the coolant lines while upgrading to rubber hoses. The oil filter plunger was replaced too. Reinstalling the new coolant lines was EXTREMELY challenging due to the tight space. Overall this isn't as difficult as one would assume, just make sure you have the requisite tools along with patience and perseverance. Finally, when attaching the upper radiator hose to the thermostat housing make sure the retaining clip is closed(down position) and push the radiator hose collar thru the retaining clip until a "click" is heard otherwise your car will overheat leaving you stranded because the hose popped out. Here's what the line looks like without thermostat and serpentine belt. I'll tackle replacing the water pump, pulleys, gaskets and resealing the driver's front timing cover at another time because it'll be pretty straight forward without dealing with risk of breaking the coolant lines. Thanks to kevim14 for providing the DIY write up.
Without much info on the person who is selling these, it would be nice for someone to vouch for their standing.
I put a bunch of info into ordering, then realized that I couldn't even contact the seller from the link above before making the purchase. Which is ok, as long as I know from others that they are reputable.
Last edited by Nor Cal SL55; Jan 30, 2026 at 02:55 PM.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
