Timing S80 T6

rustycrusty · Post by **rustycrusty** » 14 Sep 2010, 14:26

I have an S80 T6, the timing belt broke with only 30K mi. on it and the shop that did the work just shrugged and said that's tough but not my fault. The dealer here is just as bad. They had my car to fix a constant fluttering of the wind deflector that pops up when the sunroof is open. They called about mid day to inform me that the sunroof glass was broken while they were fixing and it would be $500 to fix it! I must admit that I lost it and 6years of U.S. Navy and 5 yrs of truckdriver came out!
After about 5 minutes of explaining his ancestory to him and a few other expletives thrown in he got the idea that I wasn't happy and agreed to replace the glass on his dime.

At any rate my son is doing the work now and he can't get the timing right. I saw a posting from 2007 inwhich MadeinJapan had a PDF for another poster is that what I need? My son is having trouble with the #1 cyl not being at TDC when the timing mark is aligned can anyone help?

Sorry for the rant but this car is driving all of us nuts.

Retired MVS Contributor · Post by **Retired MVS Contributor** » 14 Sep 2010, 14:55

It is not supposed to be at TDC...If it were, the intake valves would strike the piston and interfere with the ability to rotate the cam to the timing marks...The tolerances in the combustion chambers are so close that the pistons have crescent shaped relief grooves in them on the intake side for valve clearance...

The crank is to be put at the timing mark on the lower sprocket...When this is done, piston # 1 will be about 1/8 inch before TDC....Then the cams are to be set on their respective timing marks, preferably with the use of a holding tool. but not neccessary if reasonable care is exercised...

It would be very surprising if there are no bent valves if the timing belt broke while the engine was running...

rustycrusty · Post by **rustycrusty** » 14 Sep 2010, 18:02

Son just got home and we talked , I guess I didn't clarify my Question so I'll give it another go. Belt broke, valves bent,
pistons OK. Reworked cyl head and now putting back together.

When engine crankshaft rotated to "correct" mark on engine #3& #4 piston are up not #1 what am I doing wrong? Don't say
buying '99S80T6 I know that already! Just need to get this thing back together, Thanks.

Retired MVS Contributor · Post by **Retired MVS Contributor** » 15 Sep 2010, 07:06

rustycrusty wrote:Son just got home and we talked , I guess I didn't clarify my Question so I'll give it another go. Belt broke, valves bent,
pistons OK. Reworked cyl head and now putting back together.

When engine crankshaft rotated to "correct" mark on engine #3& #4 piston are up not #1 what am I doing wrong? Don't say
buying '99S80T6 I know that already! Just need to get this thing back together, Thanks.

Rusty, there must be a misunderstanding...With a 5 cylinder engine (unlike 4's, 6's and 8's) no two pistons are in the same crankshaft plane and two pistons will never be at TDC at the same time...Only one piston can be at TDC at any given time...If it is set so that #1 is on the mark, # 1 will be ALMOST at TDC and the rest of the pistons will be 'way down at varying depths...

There is an excellent write-up with pictures on this forum about replacing the head...See "Cylinder head replacement" in the repair database pinned at the top of this forum...According to the pictures this engine was on the timing mark and the position of the pistons can be seen...