Engine won't start after serpentine belt broke
08-10-2009, 01:11 AM
#31
AudiWorld Newcomer
Join Date: Aug 2009
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
From memory the pulleys dont have marks and arent keyed to the end of the cams, its just a plain morse taper.
To set the timing after something like this, you need a tool to lock the camshaft itself in the correct position, you then loosen the pulleys, then with the crank at TDC you can fit the belt, engage the tensioner then tighten the cam pulleys again.
I may be wrong, or this may only apply to certain engines though.
I have to say that if you've lost compression its quite likely the head is lunched, especially if it happened at speed.
To set the timing after something like this, you need a tool to lock the camshaft itself in the correct position, you then loosen the pulleys, then with the crank at TDC you can fit the belt, engage the tensioner then tighten the cam pulleys again.
I may be wrong, or this may only apply to certain engines though.
I have to say that if you've lost compression its quite likely the head is lunched, especially if it happened at speed.
08-10-2009, 02:53 AM
#32
From memory the pulleys dont have marks and arent keyed to the end of the cams, its just a plain morse taper.
To set the timing after something like this, you need a tool to lock the camshaft itself in the correct position, you then loosen the pulleys, then with the crank at TDC you can fit the belt, engage the tensioner then tighten the cam pulleys again.
I may be wrong, or this may only apply to certain engines though.
I have to say that if you've lost compression its quite likely the head is lunched, especially if it happened at speed.
To set the timing after something like this, you need a tool to lock the camshaft itself in the correct position, you then loosen the pulleys, then with the crank at TDC you can fit the belt, engage the tensioner then tighten the cam pulleys again.
I may be wrong, or this may only apply to certain engines though.
I have to say that if you've lost compression its quite likely the head is lunched, especially if it happened at speed.
I'd change the belt, since it's probably damaged. Just buy the belt for now until you find out what the deal is.
Once you have the belt, you need the locking bar and crank pin to set the timing. The only mark is on the crank pulley.
STFA.
08-10-2009, 04:07 AM
#33
AudiWorld Member
Join Date: Aug 2009
Location: Alabama
Posts: 16
Likes: 0
Received 0 Likes
on
0 Posts
Engrish now a4driver not many people know what putting a vehicle in service mode is.... i watched mt techs do it every day and it stills confuses the hell out of me form time to time.
08-10-2009, 08:03 AM
#34
AudiWorld Member
Join Date: Mar 2009
Location: Indiana
Posts: 118
Likes: 0
Received 0 Likes
on
0 Posts
Yes, the crank timing marks line up, which would indicate TDC. However, the #1 piston is not at the top of its bore (shouldn't it be?)...
08-10-2009, 10:08 AM
#35
Audiworld Junior Member
Thread Starter
Join Date: Jul 2009
Location: Sacramento, CA
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
TDC is cyl #3... odd. Good to know though -- thanks Midniteoyl!
I'm gonna make my own cam lock tool (I'd assume a properly sized bolt will work for the crank as well?) and line up the cams by the torque plates with the larger holes toward center and see if I have any compression.
If not, I guess I'll be looking for a new head as well...
I'm gonna make my own cam lock tool (I'd assume a properly sized bolt will work for the crank as well?) and line up the cams by the torque plates with the larger holes toward center and see if I have any compression.
If not, I guess I'll be looking for a new head as well...
08-11-2009, 12:21 AM
#36
Audiworld Junior Member
Thread Starter
Join Date: Jul 2009
Location: Sacramento, CA
Posts: 22
Likes: 0
Received 0 Likes
on
0 Posts
I lined up the RH cam and still no compression... It would appear the valves are toast. I guess I'm in the market for a new head. Does anyone have the shop manual pages for intake and head removal?
Since I'm going in this far... does anyone make aftermarket cams for these engines? Should I bother doing any port matching?
Since I'm going in this far... does anyone make aftermarket cams for these engines? Should I bother doing any port matching?
Thread
Thread Starter
Forum
Replies
Last Post
carl viking
A8 / S8 (D3 Platform) Discussion
40
Yesterday 02:45 PM
ECS Tuning-Audi
A4 (B8 Platform) Discussion
22
05-11-2024 04:38 PM
ECS Tuning-Audi
A4 (B7 Platform) Discussion
0
09-01-2015 09:16 AM
ECS Tuning-Audi
Audi A5 / S5 / RS5 Coupe & Cabrio (B8)
0
09-01-2015 08:27 AM
