VWDiesel.net The IDI, TDI, and mTDI source.

Engine Specific Info and Questions => IDI Engine => Topic started by: b1rdjx88 on March 31, 2007, 09:19:48 pm

Title: Should I pull the head?
Post by: b1rdjx88 on March 31, 2007, 09:19:48 pm

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.

Title: Should I pull the head?
Post by: burn_your_money on March 31, 2007, 09:39:44 pm

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

Title: Should I pull the head?
Post by: rwest1 on April 01, 2007, 07:15:49 am

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

Title: Should I pull the head?
Post by: Wingaman on April 01, 2007, 09:50:17 am

Don't worry about that.

Title: Should I pull the head?
Post by: idgtd on April 01, 2007, 02:02:09 pm

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.

Title: Should I pull the head?
Post by: Wingaman on April 01, 2007, 02:59:34 pm

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:

Title: Should I pull the head?
Post by: tylernt on April 01, 2007, 06:18:30 pm

I don't think you could damage the valves with the pistons using hand power if you tried.

Title: Should I pull the head?
Post by: b1rdjx88 on April 02, 2007, 05:44:50 pm

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

Title: Should I pull the head?
Post by: burn_your_money on April 02, 2007, 08:56:10 pm

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