Replacing chain tensioner oil line with AN line

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Replacing chain tensioner oil line with AN line

Postby M-tinker on Thu Dec 19, 2013 1:18 am

While replacing the oil pressure sender on my 911, I managed to cracked the thin oil line to the timing chain tensioner. Needless to say, I got a running stream of oil when I started the engine. I probably should've disconnected the cam oil line from the sender block first before loosening the oil pressure sender :oops:

But when I looked at the oil line and the banjo bolt to the tensioner, they look pretty fragile. I have a feeling they could break simply from engine vibration, or slight stretch of the line, or over torqueing the bolt. The result could be catastrophic at the track!

Has anyone tried replacing the factory lines with AN lines? It seems AN fittings and flexible high pressure lines would make a sturdy setup. I'm thinking of running -4 line for the cam oil line and -3 for the tensioner line to match the size of the factory lines. Is it a good idea? Any downside you can think of?

Thanks in advance.

-Fred
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Re: Replacing chain tensioner oil line with AN line

Postby Steve Grosekemper on Thu Dec 19, 2013 10:18 am

Fred

There is an update for those lines that includes:
* New oil line
* New "L" shaped bracket
* New line clamp
* new 3mm bolt that ties it all together.
(Left and right side are different)

This kit keeps the line from vibrating and cracking that would result in the leak you describe.
Once installed you will likely never have an issue with them.
These are all factory parts.
Update is a good idea for a street car, but mandatory for a track car.
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Re: Replacing chain tensioner oil line with AN line

Postby M-tinker on Thu Dec 19, 2013 5:24 pm

Steve, I see I have all the parts you mentioned already. Yet I still managed to crack the oil tube. Maybe this is just a user error. So you're saying if I just replace the oil tube to the tensioner and hold it with the bracket and clip, it should be fine for the track?

Thanks,

-Fred
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90 M3
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Posts: 78
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Re: Replacing chain tensioner oil line with AN line

Postby Steve Grosekemper on Tue Dec 24, 2013 7:07 pm

Fred,
Yes, if it broke it was probably twisted or suffered some sort of trauma during engine disassembly/assembly.
Replace the tube/lines and I will take a look at it at Chuckwalla on the 18th.
1-93010734702 Left side line
1-93010734809 Right side line
Use 4 new 9001311530 washers and coat them with anti-seize.
If the banjo fitting twists while tightening it will break later-be careful.
Steve Grosekemper #97
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1997 993S & 986S street cars & 911SC track car.
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Re: Replacing chain tensioner oil line with AN line

Postby M-tinker on Fri Dec 27, 2013 3:03 pm

Thanks Steve. I replaced the right side oil line. The banjo bolt was twisted so I got a new one also. I've learned to tighten the lines carefully to avoid stressing them. Also have a spare set just in case.

See you at Chuckwalla.

Fred
Fred Yip
75 911S
90 M3
M-tinker
Autocrosser
 
Posts: 78
Joined: Fri May 13, 2011 9:25 pm

Re: Replacing chain tensioner oil line with AN line

Postby Steve Grosekemper on Sun Dec 29, 2013 12:19 am

I will be there...
And I always carry a full set of lines in my spares kit.
Have saved at least 3 drivers weekends that I can remember.
(After Jae Lee and D.Q. saved my weekend several years back... it's a track CARma thing)
Steve Grosekemper #97
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1997 993S & 986S street cars & 911SC track car.
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