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Should I pull the head?
by
b1rdjx88
on 31 Mar, 2007 21:19
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I have just taken the crankshaft out of my 1.9 and it will be machined for the TDI gear this week.
While pulling the engine I accidentally bumped the number 4 piston (I think) against the valves a couple times. This happened when I was unbolting the inner CV joints. I had already taken the timing belt and crank gear off before pulling the engine and I thought the transmission was in neutral when I started wrenching the CV joint bolts... I Know I know - definitely won't be making that mistake again!
There was no sharp impact. I think at most 20ft-lbs would have been applied to the CV bolt while the piston and valve were in contact.
So should I pull the head to check for a bent valve? My plan had been to just close up the bottom end with new bearings. The engine ran quite well just before I tore into it.
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#1
by
burn_your_money
on 31 Mar, 2007 21:39
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HG jobs aren't too bad with the engine installed. I'd try it as is and then if the compression is low or it idles really rough I'd pull the head
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#2
by
rwest1
on 01 Apr, 2007 07:15
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I strongly doubt that level of valve to head contact would cause a problem. I would finish the lower end rebuild, then hand crank the engine through, checking valve operation/clearance. Unless I found a problem I would close it up and move on. I’ve seen the old 1.5’s that were just starting to chew up the keyway run along making a big doink sound every once in a while (piston hitting valve). If you caught it fast enough you could save the head/valves. Regards
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#3
by
Wingaman
on 01 Apr, 2007 09:50
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Don't worry about that.
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#4
by
idgtd
on 01 Apr, 2007 14:02
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A friend of mine with a VW diesel/samurai conversion had his T-belt jump timing while the engine was idling in his yard. We pulled the head, and no damage was found. The belt had a 14in section with no teeth on it.
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#5
by
Wingaman
on 01 Apr, 2007 14:59
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One of mine mecano forgot the lockpin on the pump on a Eurovan 2.4 Diesel (T4) and the cam timing belt slip (not the pump timing belt) when cranking and no damage was found.
We pulled the head for nothing :roll:
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#6
by
tylernt
on 01 Apr, 2007 18:18
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I don't think you could damage the valves with the pistons using hand power if you tried.
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#7
by
b1rdjx88
on 02 Apr, 2007 17:44
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Is that a challenge?!
Thanks for the reassuring replies. I will button it up this next weekend and see how it goes.
Any tips for holding the water pump pulley in place while bolting it back on the pump? I got it off no problem using two wrenches to loosen two bolts and then wedging a long bar between the two loose bolts and the floor to get the last one, but I don't know if this will work in reverse.
Also can I get away with using RTV sealant on the old oil pan gasket/baffle or do I need to buy a new ($) one?
Thanks,
Alan
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#8
by
burn_your_money
on 02 Apr, 2007 20:56
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Use one of those BOA straps to hold the pulley, shouldn't have any problems.
The baffles are rubber are they not? That would mean they are reusable