Beginner “mechanic” help me not screw up

[Chsnsurf]

My ‘85 Carrera has a pretty bad leak at the camshaft to chain tensioner line. Not sure why it has started, but even after trying to tighten,the leak persists. I figured I will just replace that line (Part #: 930-107-347-15-M20) AND the little carrier line (Part#: 930-107-347-05-INT).
Are these the correct 2 parts for the driver’s side? Any good DIY videos or steps for this? Torque specs for the lines?
I’ve removed all the plastic heater ducting and cleaned up the area, just need to replace the lines.
Next, I’m pretty sure the external oil thermostat isn’t doing its job. Oil is not sending to the front fender cooler. No pinched lines. Tips, tricks, videos on fixing the external oil thermostat? I’ve found one video by Garage Time that doesn’t make it seem easy. I don’t have welding skills or a very good local shop I can trust for the repair.
Is there some sort of external thermostat work around or bypass? Upgrade from a 964?

Thanks for helping a beginner

[john walker's workshop]

The metal lines crack at the top solder joint. There is a support bracket that you can install. Easy swap.

[Chsnsurf]

Originally Posted by john walker's workshop

The metal lines crack at the top solder joint. There is a support bracket that you can install. Easy swap.

So don’t swap the current lines and just install the support bracket?
Swap the lines AND install the support bracket?

[dg567]

Yours is likely cracked - so swap out and add the support bracket.

[Chsnsurf]

Thanks

This the right part number?
Part#: 930-107-341-00-OEM

[Mark Salvetti]

Originally Posted by Chsnsurf

Thanks

This the right part number?
Part#: 930-107-341-00-OEM

Yes, that is the correct bracket for the left side. There is different bracket on the right side.

You also need the clamp that wraps around the oil line: PCG51117402
And the pan head screw that fastens the clamp to the bracket: 90011908801
And two sealing rings where the thin metal tensioner line connects to the chain cover: 90012311530

The other issue you may find is the new metal line you are ordering may not fit the older oil line with the rubber segment. I think the oil line with the rubber segment is different now, and requires a different metal line than the original. See this thread: Oil tensioner line is too short, help?

This thread also has a good photo of how the bracket mounts.

Mark

[Chsnsurf]

Originally Posted by Mark Salvetti

Yes, that is the correct bracket for the left side. There is different bracket on the right side.

You also need the clamp that wraps around the oil line: PCG51117402
And the pan head screw that fastens the clamp to the bracket: 90011908801
And two sealing rings where the thin metal tensioner line connects to the chain cover: 90012311530

The other issue you may find is the new metal line you are ordering may not fit the older oil line with the rubber segment. I think the oil line with the rubber segment is different now, and requires a different metal line than the original. See this thread: Oil tensioner line is too short, help?

This thread also has a good photo of how the bracket mounts.

Mark

Thanks Mark. Have all the listed parts in my cart. Best to have the oil completely drained from the car or replacing these lines will only have a touch of oil and draining isn’t necessary?

Anyone have thoughts or tips on the external oil thermostat? Difficult job? Doable? Is there a bypass? Would love to wrap up some projects on this car to get it back on the road come spring.

[H-viken]

Removing any tension from the chain tensioner line when installing the new one, will make it last longer

[wazzz]

Originally Posted by Chsnsurf

Thanks Mark. Have all the listed parts in my cart. Best to have the oil completely drained from the car or replacing these lines will only have a touch of oil and draining isn’t necessary?

Anyone have thoughts or tips on the external oil thermostat? Difficult job? Doable? Is there a bypass? Would love to wrap up some projects on this car to get it back on the road come spring.

What makes you think your external thermostat doesn't work properly? At what engine temp do you check that oil lines get hot up to the front?

Mine doesn't fully open until oil temp gauge gets 3mm above first line. That's nearly 9 o'clock. See pic.

[Schulisco]

I had let a workshop doing that ugly job of overhauling the oil thermostat years ago. No easy job for a beginner, but when you're an experienced mechanic in general you should be able to make it.

There are some additional videos and info available:
https://www.youtube.com/watch?v=HbPnvMDWDmc German title, english comments Shows pretty good the hazzle you have to deal with while working on any of the oil lines....

https://youtu.be/DWDsVb5t_k8

Patience, heat - and probably some beer - will help a lot ...

You know, that your 911 has 2 oil thermostats? One external we spoke about, but also an internal one to manage the engine oil cooler next to cyl. bank #2 behind cyl. #6... Determine that this oil cooler works too.

Thomas

[wazzz]

First YT link is a 10-second commercial in German.

[Mark Salvetti]

Originally Posted by Chsnsurf

Thanks Mark. Have all the listed parts in my cart. Best to have the oil completely drained from the car or replacing these lines will only have a touch of oil and draining isn’t necessary?

Anyone have thoughts or tips on the external oil thermostat? Difficult job? Doable? Is there a bypass? Would love to wrap up some projects on this car to get it back on the road come spring.

I think you should be able to do the swap without draining any oil from the car. You shouldn't get much out of the oil lines, but definitely have a towel under the top fitting.

Forgot about the oil thermostat - was going to ask you the same questions as you got already. It probably won't open if you are idling. Now if you are overheating while driving and the oil lines are cold, then I'd be worried about either the internal thermostat or the one in front of the rear wheel to the front cooler.

Mark

[Schulisco]

Originally Posted by wazzz

First YT link is a 10-second commercial in German.

Damn.
Thanks, corrected it...

[ErrorMargin]

Originally Posted by Chsnsurf

My ‘85 Carrera has a pretty bad leak at the camshaft to chain tensioner line. Not sure why it has started, but even after trying to tighten,the leak persists. I figured I will just replace that line...

Here is a Porsche Tech Bulletin on the brackets to protect the new lines:

Originally Posted by Chsnsurf

Next, I’m pretty sure the external oil thermostat isn’t doing its job...

Why do you think it is not working?

Go for a drive and get the temperature up to 210+F. Then quickly pull over and feel the lines between the external thermostat and cooler with your hands to check if they are warm.

Here is a good post on how the external thermostat works:

https://forums.pelicanparts.com/porsche-911-technical-forum/927332-how-external-oil-thermostat-works-illustration.html

[Chsnsurf]

[QUOTE=wazzz;12399398]What makes you think your external thermostat doesn't work properly? At what engine temp do you check that oil lines get hot up to the front?

Mine doesn't fully open until oil temp gauge gets 3mm above first line. That's nearly 9 o'clock. See pic.

My temp will go above the top white line during a drive and the lines to the front cooler will still be cold.

@schulisco: thanks for your thoughts and links. I know about the 2 thermostats. With the external lines staying cold, feels like it is more the external thermostat. 🤷🏼*♂️

@mark: sounds good. For sure will have towels around. Won’t open while driving. Just figured it was the external. Internal easier to check/assess/replace? Start there and then work to the external?

@errormargin: appreciate the schematic and tips!

[Schulisco]

[QUOTE=Chsnsurf;12399681]

Originally Posted by wazzz

What makes you think your external thermostat doesn't work properly? At what engine temp do you check that oil lines get hot up to the front?

Mine doesn't fully open until oil temp gauge gets 3mm above first line. That's nearly 9 o'clock. See pic.

My temp will go above the top white line during a drive and the lines to the front cooler will still be cold.

@schulisco: thanks for your thoughts and links. I know about the 2 thermostats. With the external lines staying cold, feels like it is more the external thermostat. 🤷🏼*♂️
!

The external oil thermostat opens up at 83°C/181°F (IIRC I read somewhere about 87°C/188°F don't know). Refer to what the '82 911 SC manual says:



I guess the values of the later Carrera won't have changed much. As they run leaner than the CIS equipped SCs they may run a little hotter, but not that much.

If the oil lines and the fender oil cooler remain cold when the gauge climbs to the middle then the thermostat is the culprit most likely. OTOH make sure that your mixture setting switch at the engine ECU under drivers seat is set correctly to your engine and area. (https://www.swchips.com/fuelsys.html)

What kind of temp gauge do you have in your car?



Thomas

[Chsnsurf]

I have style B in my car. I always drive in a way that warms up the engine first before doing any “harder” driving. I’ll take a look at my mixture setting switch and read up on that, but I’ve had the car here for 5 years now and this hasn’t been an issue until recently. About same time the leak at the chain tensioner started.

[nickelplated5s]

Buy a set of flare wrenches for those type fittings.

[Chsnsurf]

Originally Posted by nickelplated5s

Buy a set of flare wrenches for those type fittings.

Got em already.

[GH85Carrera]

One issue I had with the oil lines was the banjo bolt with the two washers. I kept getting a leak, even after swapping the washers for new ones. The entire assembly of washes and banjo bolt have to be super clean, and just the right amount of torque to keep them leak free.