4 holes to give reason to changing your timing belt

south26 · Post by **south26** » Jun 05, 2011 9:07 PM

Hi, I was taking a head off a m20 from a e34. I bought the car to part out. I was told that it had a blown head gasket. Well I have never seen a gasket go like this. I did not count but a number of rockers broke. 6 valves broke, one stuck in a piston. 4 out of the 6 pistons had holes in them.

Remember change your timing belt.

Andy

TSMacNeil · Post by **TSMacNeil** » Jun 05, 2011 9:16 PM

Wow, waited too long to change the chelt.

slammin_e28 · Post by **slammin_e28** » Jun 05, 2011 9:57 PM

WOW! (Insert generic pro-M30/timing chain smart ass remark here) That sucks for whoever had it let loose!

south26 · Post by **south26** » Jun 05, 2011 10:02 PM

Ya the guy I got it from was told by a shop that it just needed a tune up. So the shop replaced the cap and rotor, wires and did some other stuff to help it run. Well it did not help.

Andy

winfred · Post by **winfred** » Jun 05, 2011 10:11 PM

damn...... never seen one pop that many valve head off, usually just one breaks off if any, musta been on the limiter when it went

slammin_e28 · Post by **slammin_e28** » Jun 05, 2011 10:23 PM

winfred wrote:damn...... never seen one pop that many valve head off, usually just one breaks off if any, musta been on the limiter when it went

The best way for one to go IMO! Must have been spectacular!

WVe28 · Post by **WVe28** » Jun 05, 2011 11:16 PM

Could someone really think that the catastrophic noise that must have ensued when that thing went was just a head gasket?? Wow.

Cactus · Post by **Cactus** » Jun 06, 2011 1:04 AM

I love how people will blame anything on a head gasket. The kid I bought my old saab from said it had a blown headgasket. It had actually spun a bearing and ruined the crankshaft flange.

Hey, I don't have my bentley handy, what size torx socket do you need for those. E16?

Alfonso Bedoya · Post by **Alfonso Bedoya** » Jun 06, 2011 2:16 AM

Heeheheheheheheheheheheh

heh........he said holes.

slammin_e28 · Post by **slammin_e28** » Jun 06, 2011 8:16 AM

Cactus wrote:I love how people will blame anything on a head gasket. The kid I bought my old saab from said it had a blown headgasket. It had actually spun a bearing and ruined the crankshaft flange.

My e30 had a "blown HG" but it was just the valve cover gasket and half moon seals leaking.

I had those laying around, so no cost to me!

Duke · Post by **Duke** » Jun 06, 2011 8:41 AM

Is that Mitch's engine?

davintosh · Post by **davintosh** » Jun 06, 2011 10:06 AM

Duke wrote:Is that Mitch's engine?

It's Mick. MickForrest. We knew he'd be back.

slammin_e28 · Post by **slammin_e28** » Jun 06, 2011 10:40 AM

davintosh wrote:
Duke wrote:Is that Mitch's engine?
It's Mick. MickForrest. We knew he'd be back.

...but I though he had a chain!?

Bimmerguy2002 · Post by **Bimmerguy2002** » Jun 06, 2011 10:42 AM

slammin_e28 wrote:
davintosh wrote:
Duke wrote:Is that Mitch's engine?
It's Mick. MickForrest. We knew he'd be back.

...but I though he had a chain!?

a modified chelt, its even capable of supporting dukes ego

rodpaine · Post by **rodpaine** » Jun 06, 2011 12:20 PM

Andy,
I don't see any rocker arms broken, but the rocker arm shaft bushing webs are toast, which puts the head in the same class. You have any larger photos other then these iPod size pics? I'd like to show this damage to a few people, who need to wake up.
-Rod

Xenocide · Post by **Xenocide** » Jun 06, 2011 12:58 PM

Holy crap! That's some damage! Did it let go at the Lemons rodthrowapolooza?

Snakeyestx · Post by **Snakeyestx** » Jun 06, 2011 3:06 PM

HG huh? You would think the complete lack of vacuum pressure to the brake booster would have been a dead givaway it was something much, MUCH worse.

The holes remind me of the untimely end of my XJ-6. Yes, it had chains and half a million chain guides. I hated that engine and it's 10 miles of vacuum lines and crap guides, but it actually broke because of faulty tappet guides coming apart and allowing the valve to shake side to side until the head breaks off (a "hold down kit" aka band-aid was made by a local shop here that required machining the head to accept the bolts for the kits at arm+leg prices for each two guides it held down). Vacuum pressure? What vacuum pressure? I managed to drive it home on 5 and a quarter cylinders knowing it was unrepairable when it went with almost no brakes. Parted the car for more than I paid for it a year prior.

south26 · Post by **south26** » Jun 07, 2011 10:30 PM

Well, I had to refund the money on the block. Does anyone have a m20 e34 block?

Andy

a · Post by a » Jun 07, 2011 10:38 PM

Snakeyestx wrote:HG huh? You would think the complete lack of vacuum pressure to the brake booster would have been a dead givaway it was something much, MUCH worse.

The holes remind me of the untimely end of my XJ-6. Yes, it had chains and half a million chain guides. I hated that engine and it's 10 miles of vacuum lines and crap guides, but it actually broke because of faulty tappet guides coming apart and allowing the valve to shake side to side until the head breaks off (a "hold down kit" aka band-aid was made by a local shop here that required machining the head to accept the bolts for the kits at arm+leg prices for each two guides it held down). Vacuum pressure? What vacuum pressure? I managed to drive it home on 5 and a quarter cylinders knowing it was unrepairable when it went with almost no brakes. Parted the car for more than I paid for it a year prior.

Et Tu, Snakeyes, had an XJ6 as well? That is 3 cars we have in common. Is there an emoticon for high five?

south26 · Post by **south26** » Mar 30, 2012 10:36 PM

Finely took this piece to the junk yard. once again here is a reminder to change your timing belt.

Andy

Frybrid 524td · Post by **Frybrid 524td** » Mar 31, 2012 2:31 PM

south26 wrote:Finely took this piece to the junk yard. once again here is a reminder to change your timing belt.

Andy

Perhaps this should be stickied so the pictures can be referenced quickly for newcomers who question the "change your timing belt" mantra.

Any chance you could upload larger pictures?

Xenocide · Post by **Xenocide** » Mar 31, 2012 4:18 PM

I still can't get over how bad the damage is on that one. I've seen some torn up m20s before, but that's just impressive. The worst I've seen is 4 broken rockers and cracked rocker arm rod bosses on the head.

south26 · Post by **south26** » Mar 31, 2012 10:14 PM

I will see if I can load bigger pics.

Andy.

south26 · Post by **south26** » Jul 27, 2012 10:41 AM

sorry no bigger pics, but I can not believe I just sold a part to a person that had the 528e for 5 years and did not know that it had a belt.

Post by **mooseheadm5** » Jul 27, 2012 10:46 AM

south26 wrote:Finely

Aren't you a teacher?

south26 · Post by **south26** » Jul 27, 2012 10:49 AM

ya, well u no i had to tpye real fast wit gading papers

tn535i · Post by **tn535i** » Jul 27, 2012 2:39 PM

Is it possible the belt stripped some teeth and then the 'mechanic' (may not apply in this case) rotated the cam while changing the cap and rotor which re-engaged some good teeth on the belt and then tried to start it a few more times with more dmage occuring?

I think only two valves are ever open at the same time and when a belt brakes you break those valves but it would have to slip and sorta stop and start again horribly out of time to do that.

oldskool · Post by **oldskool** » Jul 27, 2012 6:10 PM

south26 wrote:ya, well u no i had to tpye real fast wit gading papers

-nice save, irregardless.

Post by **mooseheadm5** » Jul 29, 2012 3:51 PM

tn535i wrote:Is it possible the belt stripped some teeth and then the 'mechanic' (may not apply in this case) rotated the cam while changing the cap and rotor which re-engaged some good teeth on the belt and then tried to start it a few more times with more dmage occuring?

I think only two valves are ever open at the same time and when a belt brakes you break those valves but it would have to slip and sorta stop and start again horribly out of time to do that.

Had a customer with one that broke at interstate speed. Head looked just like this. Probably skipped time or stripped a couple of teeth and kept going.

tn535i · Post by **tn535i** » Jul 30, 2012 7:57 AM

When one of our M20's had a rocker break at 70 ish and the cam stopped dead in it's tracks it only bent one valve. The one where the rocker broke should have been open and was undamaged since it was closed while one other valve was open and it bent. SO I am pretty sure that a clean break couldn't do this. It would have to skip time and more or less keep going for a bit.

And why does it always seem like the exhaust side gets so much damage compared to intake. At least thats what I've noticed in many pictures? Extra heat or difference in valves themselves?

MyE28.com

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4 holes to give reason to changing your timing belt

4 holes to give reason to changing your timing belt