Re: timing belt broke after fixing it two cyclinders...
Not sure what engine you have but check compression on the 2 cylinders in question,if they read below 100 psi more than likley the pistons hit some valves and they are bent, heads would need to be removed replace valves,a big deal
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That smoke was the buildup carbon that was built up in the cyclinders that the tuneup broke loose. the screeching from the belt could be either a dry belt, a belt tensioner bad, or a belt bearing going bad
7 hours. at my shop $50 per hour equals $350 the high retail for the belt is $58 and it'swiseand maybe nessary to changethewater pump while the work is being done. This is for the 6 cylinder car and changing the oils seals on the oil pump and the cam shafts. The belt is supposed to be changed every 80 thousand miles and the seals and the waterpump shoould be changed too. If the belt failed ( broke) the the engine may be damged and have to be rebuilt to repair the damage or even replaced ( the whole engine). the 4 cyclinder is different. The V Tec taks 4 hours before changing the seals and the water pump. add 2 1/2 hours for that. the twin cam non v tec is about the same but if the belt isbroken all this is for not.as theengine may ( it does'nt have to be) damaged.and sometimes beyond resonable repair. ( you can fix anything if you spend enough money) If the engines damaged by a broken timing belt a good used moter installed is likly better an cheaper.
Double check and make sure you are set to #1 TDC then verify you have the timing marks aligned correctly. This happens a lot when the timing marks slip and the vehicle is 90 to 100 degrees out of time. If it were 180 degrees out it would start but run very rough. If you replaced the timing belt because it broke while the engine was running do a compression check or connect a small compressor to a line you can screw into the the spark plug holes and see if you have any compression or in 2 or more cylinders have no compression. If this test is true your valves are bent and you will have to have the head rebuilt.
I'm not sure what you mean by "a free floating engine".
If your engine still runs you most likely broke the serpintine belt not the timing belt.
If you broke your timing belt you need to have your engine check over carefully. When the timing belt breaks the valve stop moving but the pistons keep going for a few revolutions. This usually ends up damaging your valves and/or your pistons. On rare occassions it can sometimes even damage the
head(s) or block.
DO NOT TRY TO START THE ENGINE BEFORE IT'S REPAIRED, THIS WILL RESULT IN MORE DAMAGE!
If you're planning on fixing this yourself you need to pay careful attention to the timing, you can have the timing marks perfectly aligned and still be off by 180°.
Once you have the belt fixed you'll need to do a compression test to see if there is any damage to the engine. If you have a difference of more than 10% on any cyclinder you'll need to take the head(s) off and check for damage.
If you want further help with this you can contact me through this web site.
Go to any autoparts store and get a manual for your vehicle. Installing a timing belt incorrectly can cause major engine damage. If this belt broke while driving you may already have bent valves. Timing belts should be repalced every 60,000 miles.
not to worry. if timing belt broke your engine is fine. it is an overhead cam engine. although there is a good chance depending on your motor size. that one of the composite sprockets the belt runs on broke also. it is common.