- Jan 7, 2017
Just delivered. Took about 10 days from Canada. Weird.
Oh man that's not good, strange to see that happen because there are alot of them on other cars without any reported issues.Bad news: The Malo leaked badly! What a mess...I’ll be returning mine for a full refund.
The diameter of the Malo’s channel holding the large o-ring appears to be about 0.4mm - 0.9mm smaller than that of stock. I will be doing a full reporting later this weekend. But here are some photos:
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@JeffmanHi there, I was just informed about that post and I'm very surprised to see the pictures. Did you re-use an oring that was installed in your previous cap and possibly pierce it while removing it? Also what do you mean by 0.4 to 0.9mm? Is the cap oval?
I made them to the same size as the OEM filters and measured everything with a micrometer.
Please get in touch with me so can figure out what went wrong. All my current caps where run off the same set up and that's the first time someone reported it leaking.
Interesting, I never had an issue with my mann filters and their O-rings. Just lube it up with engine oil to help it slide on, and make sure it is not rolled or pinched like you said.A twisted o ring from rolling it on has been a problem for me as well as some from one of the brands , bosch I think.
I had to open it up and replace the oring a couple times until I got into my stash of filters from mahle and then it was good.
Yikes that's unfortunate. I wonder why this has occured on your car vs. the others that have had no problems.No problem with the o-ring. I lubed it with oil and it went on the Malo just fine. Interestingly, I was able to screw the Malo into the oil filter housing all the way down with my hands - no tools needed. That was kind of odd - there was essentially no additional turning needed when torquing to 25 nM.
I went for a drive to warm it up and suspected a problem when I started to smell oil - it leaked all over, down the oil filter housing, on the belt, flinging on the underside of the hood, on the alternator, down the engine block into the bottom tray, and onto my driveway, etc.
I allowed it to cool before removing, inspecting, measuring and comparing to the stock one. I suspected one of the Malo dimensions may have been off because it screwed on so easily.
I measured the following with a micrometer:
- Diameter over the threads.
- Diameter over the installed o-ring.
- Length of the threaded portion.
I took several measurements of each dimension. My raw data sheet is provided below, which shows that the diameter measured over the installed o-ring on the Malo (88.23 mm, 88.33 mm) is about 1 mm narrower than that of the stock oil cap (89.19 mm, 89.23 mm). I believe this caused the leak:
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Next, I removed and inspected the o-rings - they looked fine and were identical. So I reasoned that the diameter of the o-ring channel on the Malo must be smaller compared to stock.
First, I put them side-by-side and took the following photo to compare the o-ring channels:
Stock on left. Malo on right.
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It’s hard to see the difference in this photo, but it looks like the o-ring channel on the Malo may be slightly deeper. So then I measured the o-ring channel with a micrometer as I showed in my earlier post. Since the caliper ends of my micrometer are slightly shorter than the radius of the oil caps, I placed the micrometer beam in the o-ring groove, and then squeezed the caliper ends into the o-ring groove to take a measurement. As you can see the measurement of the Malo o-ring groove is 82.83 mm, whereas the measurement of the stock o-ring groove is 83.26 mm. This means that the stock o-ring will stick out further from the threads and seal more tightly against the oil filter housing. Or, in other words, the Malo o-ring will not stick out as much and seal less tightly against the oil filter housing. This is exactly consistent with all of my measurements and observations:
1. The Malo screwed down easily into the oil filter housing and hardly budged when torqued.
2. The diameter measured over the installed o-ring on the Malo is about 1mm smaller than stock.
3. The oil badly leaked.
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|Brand||O-ring Groove Width (mm)||O-ring Groove Height (mm)|
I see a potential issue with your measurements, it is that your caliper might not be long enough to reach the true maximum diameter of the O-ring groove.
I would feel more comfortable if this dimension in the MaLo were closer to stock. It would help to remove the risk of on oil leak due to someone reusing a <3000 mile o-ring like I did.
Yep. Good point on the o-rings. And I had recognized that I wasn’t measuring true diameter. I only had the Nieko digital caliper and did the best I could, as indicated in my post above:I see a potential issue with your measurements, it is that your caliper might not be long enough to reach the true maximum diameter of the O-ring groove.
The next issue is that O-rings are like copper crush washers - one time use only, otherwise they get deformed when you mush them down and heat cycle it. Once it is in there I doubt there will be an issue if you don't remove it.