Where is the timing mark on a Porsche 911?
With the engine at TDC for cylinder #1, and the small punch mark on the cams pointing upwards, the engine now can be timed for firing on cylinder one. Start with the left side of the motor, and use vise-grips to clamp the end of the wheel sprocket lever arm to the edge of the chain housing.
When to see a mechanic about your timing chain?
Issues with the chain are pretty common in high mileage vehicles, so if you are driving an older vehicle, or one with a lot of miles, it is best to be on the lookout for symptoms of the timing chain going bad or failing. If you do start noticing problems, or your vehicle, contact a certified mechanic to have your timing chain replaced.
What happens if you snap the timing belt on a Porsche 928?
In all but the very early 928’s a snap of the belt allows the valves and pistons to crash resulting in catastrophic engine (and financial) damage. Clearly the function of the timing-belt and its related components is absolutely critical.
Where is the chain tensioner on a Porsche 911?
If you have a mechanical chain tensioner, you can use it on the right side of the motor during the timing process and swap it out before you seal up the chain housings. The mechanical chain tensioner was used originally on Porsche race cars, and is not spring loaded.
How do you replace a Porsche timing chain tensioner?
Use a 27mm socket and ratchet to break loose the tensioner. Note that the tensioner has lots of threads; therefore, it will take a lot of turning to remove it. Replace one tensioner at a time. Prime the new tensioner. Soak the new tensioner in engine oil; while it is soaked in oil, pump it a few times to prime it.
Can a IMS chain tensioner be replaced in a Porsche?
Porsches have up to three tensioners. IMS chain tensioner and bank 4-6 tensioner can be replaced with the engine in the car. Bank 1-3 tensioner may require accessories to be removed to access it. Use a 27mm socket and ratchet to break loose the tensioner.
Why does my Porsche make noise when I start the engine?
One of the most common issues that cause Porsche engine noise for about 5 to 10 seconds on startup is a weak timing chain tensioner that is not maintaining hydraulic pressure when the engine is turned off and parked for an extended time. Engine won’t stay running. Record the timing marks before you start work.
How many tensioners does a Porsche have?
After you replace each tensioner, crank the engine by hand two full revolutions before you start it. Porsches typically have three tensioners.