Astra 2007 1.8 cam belt timing

when you put belt back make sure timing mark is aligned / in correct spot

What engine is it.

Replace belt about every 75000 miles.. and yes replace water pump and tensioner... for its a timing belt driven waterpump

right it a twin cam engine
the cam chain between the two cams
depends what cams are there
do these help

TS Astra timing belt - Automotive - Whirlpool

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Timing Belt & Water Pump Replacement : Water ... - YouTube

? 4:11
https://www.youtube.com/watch?v=mRHa0LJR9HA
Dec 7, 2008 - Uploaded by expertvillage
This is my first timing belt change on my 2005 Toyota Sienna; and I am .... just switch my cam sprockets backwards and upgrade my 2.0 to a 2.4.

If the tensioner is for the cam timing belt then it certainly WAS touched. You can't install a new belt without releasing the tensioner.
Maybe you can back off a bit and see if they won't share the cost of maybe finding a used replacement engine from a salvage yard - you pay 25% and they cover 75% or some other arrangement. A used engine is going to be cheaper than rebuilding your damage engine.

After all, you didn't wrench on the engine, they did.

remove the rocker cover and look on the ends of the cams ,their are slots and they align with the head ,i use my old spanner from my angle grinder its just about the right thickness ,lower pistons to the middle then set the cams ,make sure no1 the valves point up and outwards like a V victory sign then bring the no1 piston up to TDC ,i take the plug out and use a long thin screwdriver for this .then put the belt on

Now is this a 1.8 petrol twin cam or a single cam engine as it will be the same as our opel astra or zaffiro but these belts do not stretch and as such iam perplexed a bit by your question here but either engine can be tightened but shouldnt need it really

For 1999 Vauxhall Astra 1.6 16V timing belt replacement interval is: 60000 km (37500 miles), or 48 months (4 years). Replace also tensioner roller, (the same interval) !
If you don't know precisely if timing belt has been done, then replace it obligatory !!!

Please rate my response. Thanks!

put the dot on cam gears in between 2 dots on engine case. crank needs to be at TDC