Wet belt failure

[ezimoto]

Hi guys, I have a 2020 2.0 fwd custom Euro 6.2. Wet belt has failed at 50k but doesn't seem that unusual sadly.
Stripped to find it has bent valves but hardly a mark on any pistons. My question is whether there is a way to check pistons or does it have to be fully dismantled?
Any input would be welcome, I'm very tempted to just repair top end must perhaps this is a bad plan?
Thanks in advance.

[metalworker0]

50,000 is a new record .
I'm just going from reports and watching dozens youtube videos over a few years... and reading posts here.. ive sort of made my duty to watch all i find to help others with this

This is what happens in a mild case .( how many rpm, determines how much damage is done)
. Pistons may be a little marked .. but not badly damaged .. you'll be replacing the whole CAM CARRIER ... as this is where the main damage will be .. the lobes on the shafts are a press fit .. and rotate permanently out phase when the belt snaps .. some rockers will usually be cracked...some broken in half.

NOTE : you cannot replace individual camshafts .. as the whole cam carrier and shafts is not meant to/ cannot be disassembled.

As far as i can tell, the only way to check the cam-lobes is to have a brand new carrier at the side of it .. you'll be on a surface plate with a dial test indicator ... seeing how one compares to the other .... well if you have the brand new one .. you are going to use it !

As well as this ,you need to look at the vacuum pump .. as debris block it .which you'll be doing anyway since at has to come off to swap the carrier

A look with enhanced boroscope that twists and looks up at the valves is recommended, if you are not taking the head off.

then you need the whole cambelt kit .. that includes oil pump belt .. and timing cover.. as it never survives being taken off, bolt.. some opt to replace the sump .. as it has to come off .. and can be damaged warped getting it off

all the best.mark

[dumper]

Also when you get it back together Ford now recommend the same oil spec as the 2.2 puma engine and have reduced the charge intervals to 24000 miles I’ve just changed mine at 11000 miles when I got it used as mark said a lot on YouTube that have not removed the head just cam carrier and associated Parts

[metalworker0]

OH yeah ... once cam carrier removed you can do a leak down test, as all valves will be closed.
You cant do the compression test .. as valves are closed .. they have to open to suck in air to be compressed.

if it fails the leak down test .. you will be taking the head off, don't ask me how many psi and for how long .. i don't know .. you'll be mainly listening for leaks. in the exhaust ports and in the inlet ports

all the best.mark

[ezimoto]

Thanks for the reply Mark.
As I said, the head is off and definitely has bent valves and also a distorted camshaft (no broken rockers but I'll replace them anyway).
My question is if theres a way to check pistons / bottom end without stripping further? There's hardly a mark on any piston crowns.

[metalworker0]

there will be a piston protrusion measurement.

you can look to see if all come up to the same height .. if one is lower .. then it has a bent rod.

Thickness of cylinder head gasket with piston protrusion of 0.671 -
0.720 mm
1.30 (one tooth)
Grade 1
Thickness of cylinder head gasket with piston protrusion of 0.721 -
0.770 mm
1.35 (two teeth)
Grade 2
Thickness of cylinder head gasket with piston protrusion of 0.771 -
0.820 mm
1.40 (three teeth)
Grade 3
Thickness of cylinder head gasket with piston protrusion of 0.821 -
0.870 mm
1.45 (four teeth)
Grade 4
Thickness of cylinder head gasket with piston protrusion of 0.871 -
0.920 mm
1.50 (five teeth)
Grade 5

teeth refers to code of notches on the side of the gasket

looks obvious they had different protrusions in production , use dial gauge to measure

all the best.mark