When a 911 flat-6 engine reaches 300,000 kms

AUSTmike · 12-22-2013, 03:03 AM

hi guys, I know this guy who owns a 2.7 ltr and its done nearly 300,000kms on it.the guy has had the car for 15 years and he has never had any problems with the motor .he has really looked after the car and its been garaged all its life.he said the previous owner replaced some parts in the motor before he sold the car to the owner of today.I guessing if this guy has had the car for 15 years ,he must of done regular services to the car for the engine to be problem free for 15 years.....

I wonder for the motor to last many more years would a timing chain and hydraulic tensioner upgrade or replaced would get many more miles out of the engine.

also the engine is working and running GREAT and is smooth and is powerful.

Daves911L · Daves911L's Garage

Not sure exactly what you are getting at with your question. Sounds as if your friend has a 2.7 that the previous owner correctly rebuilt. Like all 911 motors, it can last a very long time if properly cared for.

There should be no need to replace chains at this mileage. They are wearing of course, but other components are as well. The sprockets are wearing as much, if not more than the chains. The cams and rocker arms are wearing. Perhaps more critically, the rings, ringlands, and cylinders are wearing. The valve train is wearing. Bottom end bearings are wearing. Well, you get the idea.

The hydraulic tensioner "upgrade" has nothing to do with longevity or engine wear, it just changes the original sealed (but still hydraulic) tensioners to an unsealed, continuously renewed style. In effect, it replaces a regular maintenance item that was commonly ignored until it failed, with a no-maintenance item.

DG

AUSTmike · 12-22-2013, 10:05 AM

Goods points there Dave!.. If the motor still runs great and going by its problem free life it may still go strong for another 100,000 or so .do you think giving more oil changes may help it life! I thought of the tensioners because if the tensioners let go for instants, the cam sprocket may jump a cog and bend a valve or worst situation put the value through a piston. I was thinking if the tensioners were done at least it can put your mind at rest knowing that one of the biggest problems in the timing is a tensioner failure. watch this video about the tensioners and how important as you know they are!

Porsche 911 chain tensioner story - YouTube

HarryD · 12-22-2013, 11:17 AM

When I have my heads renewed (worn guides), I had the mechanic replace my old style tensioners with the Carrera ones. While I have no regrets in doing this, knowing what I know now, I would have kept the 930 tensioners (they were upgraded at some point by one of the PO's) and made sure the newer chain wheel supports were installed as well.

Anyway, my $0.02

AUSTmike · 12-22-2013, 06:43 PM

when you mean chain supports Harry do you mean the chain bridge rails!... the straight pieces that clip in place where the chain runs on top of the part with the grooves or guides?.... I think also this would give you a little piece of mind knowing that the chains and tensioners are serviced at lease this will support the rest of the engine when its done a few kms. also if your plan is to get a rebuild engine later on keeping the tensioners serviced and do regular checks yourself or your mechanic that can help. I guess what i am saying is if a motor has done many kms and the motor is still doing strong and well,you can do more regular check ups and oil changes and ask your mechanic about oil burning,ect to keep regular reports on how the engine is going inside.

Walt Fricke · 12-22-2013, 07:14 PM

I think he means the piece which holds the chain wheel and pivots. The newer piece has a wider bushing where it pivots, which means the tensioner is thinner at that point to compensate.

Guys who add the 930 part, or the Carrera tensioners, either have to use the old chain wheel supports and add a spacer, or upgrade that part also, which is the way to do it.

Big Jon Jacobs · 12-22-2013, 09:56 PM

I say a boy, I say there boy! She's just getting warmed up. So keep going.

HarryD · 12-22-2013, 10:09 PM

Quote:

I think he means the piece which holds the chain wheel and pivots. The newer piece has a wider bushing where it pivots, which means the tensioner is thinner at that point to compensate.

Guys who add the 930 part, or the Carrera tensioners, either have to use the old chain wheel supports and add a spacer, or upgrade that part also, which is the way to do it.

Thanks Walt. I was saying to upgrade the support. From what I have been able to find out, the upgraded support is a major part of the improvement.

AUSTmike · 12-22-2013, 10:42 PM

here is a service kit on ebay that could be worth while just to keep the tensioners in top condition..

check out the kit here:

Porsche 911 911T 914 New Factory Chain Tensioner Repair Kit 911 105 901 01 | eBay

If your motor is running good and its done a few kms or miles keeping tensioners in good working order with regular services would may help keep the motor running well when its done alot of kms