snapped timing belt and blown headgasket. - page 1 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• snapped timing belt and blown headgasket. by vdubspeed on 30 Sep, 2011 05:40
• I might be buying a mk2 1.6 N/A Jetta today that lost a timing belt. Owner was into fixing everything but the ever important t-belt. I'm sure it looks terrible in there so I'm assuming I will have to toss in another motor.
  
  I have another 1.6 that ran BUT has a blown headgasket.
  
  Now normally on a gasser I would rip off the head, have the head decked(valves in), and toss it back together.
  
  I know diesels have a VERY low deck and I'm sure the valves will have to be pulled (atleast one). Is it common practice in the idi world to just deck the head to get a nice new flat surfance and reinstall or??? utm.
  
  Thanks,
  
  Jason
• #1 by Mark(The Miser)UK on 30 Sep, 2011 07:09
• What was the owner doing as the engine failed?
  
  How blown is is other engine's gasket?
• #2 by vdubspeed on 30 Sep, 2011 07:41
• Your first question is a good one...I haven't asked yet. I will assume the worst though and say he was cruising along...therefore...engine death. If it was at idle...it may be salvageable.
  
  The other engine with the blown headgasket ran fine but water moisture came out the exhaust pipe and it sounded like a steam machine(Water boiling).
• #3 by rodpaslow on 30 Sep, 2011 09:00
• I've done the blown head gasket thing after loosing all the coolant.  If that's what happened to the other one and that's why the head gasket is blown you will be needing a new head.  If it was just oil leaking into the coolant or vise versa, you can usually just take the head off,new head bolts and gasket; throw it back together and you're as good as gold.
  
  If lost all the coolant and new head at minimum.  If it were me, usually the rings are toasted as well.  I'd be starting from scratch will a full teardown... 
  
  If it were me I'd look at how bad the one you're buying is first.
• #4 by vanbcguy on 01 Oct, 2011 10:50
• On the busted T-belt engine you might have nothing more than a couple bent valves.  If both engines are the same breed (hydraulic / mechanical) then you should have plenty of valves to go around. 
  
  Chances are the bottom end in the busted T-belt engine is completely fine as you know it was in running order when the T-belt broke!
• #5 by Mark(The Miser)UK on 01 Oct, 2011 12:52
• Quote from: rodpaslow on 30 Sep, 2011 09:00

  I've done the blown head gasket thing after loosing all the coolant.  If that's what happened to the other one and that's why the head gasket is blown you will be needing a new head.  If it was just oil leaking into the coolant or vise versa, you can usually just take the head off,new head bolts and gasket; throw it back together and you're as good as gold.
  
  If lost all the coolant and new head at minimum.  If it were me, usually the rings are toasted as well.  I'd be starting from scratch will a full teardown... 
  
  If it were me I'd look at how bad the one you're buying is first.
  

  How can you be spewing all this doom and gloom. 
  Death of head unlikely unless loss of coolant was not noticed for a significant time, or new coolant added to a piping hot engine. Why are rings likely gone?
• #6 by vdubspeed on 01 Oct, 2011 13:19
• I didn't listen to the brimstone and hellfire. I have replaced PLENTY of 20V heads after the t-belts snapped. And for the record...the belt snapped in 2nd gear while going around a corner on a dirt road. No more than 2K RPMs. I will pull the head tomorrow of the snapped t-belt. If it looks good...valve swap and it's back on the motor!
• #7 by Mark(The Miser)UK on 01 Oct, 2011 15:14
•  
• #8 by maxfax on 01 Oct, 2011 19:49
• If I read the post right, I think Rod's hell and brimstone forecast was referring to the the engine with the blown HG..  Which I agree with what he is saying..  Unless you were along for the ride when it blew, it's hard to tell how hot it got..  Amazing the people that thing red lights (or the red part of the gauge) means "stop driving when you get where you are going.. 
  
  I'd also say, pop the head on the t-belt engine, replace some valves and be on your way...If it's hyrdro lifter, check them out good too....
• #9 by vdubspeed on 03 Oct, 2011 11:43
• holy ***! Both engines apart!
  
  First off..the t-belt snap. Well scratch that head! The piston pushed the valve up and snapped the cam in three places PLUS broke the bearing caps off. Bottom end looked great though!
  
  Next up was the blown headgasket engine. Got that apart. F-me...one of the cylinders had an exhaust valve that was missing 15% of it's foot and the piston had shrapnel all in it. Worst of all it ruined the piston walls. To add insult to injury, it had a broken injector boss too from a prior repair. Crazy enough...this motor RAN...not well mind you but it ran and sounded like it a misfire(LOL).
  
  SO....I'm going to use my last mech 1.6 head I had lying around with an unknown history. All I know is that it's a turbo head. Then I'm going to seal the ole oil return on the hydro block and get them together. I plan to use the 12mm bolt but cut off the washer and use 11mm washers. Tomorrow I'll ream out the 11mm head for the 12mm studs and then it's off to be rebuilt by my local head guy(he does great head work )
  
  I'll let ya'll know how it turns out.
• #10 by vdubspeed on 03 Oct, 2011 11:51
• pics for clarity. This first picture is what I thought was a blown headgasket car. It missed and had a gurgling sound...now I know why!
  
  
  And here's what's left of the snapped t-belt head:
  
• #11 by ORCoaster on 03 Oct, 2011 12:15
• Never seen a dual overhead cam like that in a VW.  Crapped to pieces.
• #12 by burn_your_money on 03 Oct, 2011 12:39
• brimstone and hellfire indeed!
• #13 by vdubspeed on 03 Oct, 2011 13:30
• WTB: 1.6L head please. preferably 11mm or 12mm.
• #14 by Mark(The Miser)UK on 03 Oct, 2011 16:54
• Doom and gloom 1, Optimists 0
  
  Burnt valve must surely be lack of valve 'shim' gap.
  No cracks between valves either