Author Topic: Motor has thrown in the towel (Read 8081 times)

dude8383 · « **on:** October 11, 2007, 12:02:34 PM »

SOO...

I'm going to be tearing it down today because the sprockets, guides, rails and chain need to be replaced!

There's one thing thats bothering me though. Once I complete this, I need to align both the block and the head to TDC...HOWEVER, I no longer have the stock flywheel (m20) on the car.

I'm afraid the alignment hole for TDC is not going to be in the same spot as it was before.

What do you guys recommend? Also, any other recommendations as to what I should take care of while I'm in there..

Thanks!!!

sheepdog · « **Reply #1 on:** October 11, 2007, 12:19:09 PM »

Run a dial indicator down into the #1 piston. When it tops out...

A rod works too, but is less accurate.

dude8383 · « **Reply #2 on:** October 11, 2007, 12:35:41 PM »

Quote from: sheepdog;35489

Run a dial indicator down into the #1 piston. When it tops out...

A rod works too, but is less accurate.

Hmm I can see how the rod would work, but not sure what a dial indicator is...how would i use it?

bmwman91 · « **Reply #3 on:** October 11, 2007, 01:13:39 PM »

No sweat man, I had the same issue.

Liek Sheepdog said, you can use either of those methods. With someone helping you, you can get the crank within a fraction of a degree of TDC...with patience you can get it positioned well enough that you will have nothing to worry about. Just don't rush it.

The dial indicator he refers to is not something a lot of people have alying around, and it is not a cheap tool. I say try the luck with a welding rod lol.

Febi Guibo · « **Reply #4 on:** October 11, 2007, 01:22:55 PM »

boy doesn't it suck when something just goes and quits on you!!?

dude8383 · « **Reply #5 on:** October 11, 2007, 03:53:35 PM »

Quote from: Febi Guibo;35496

boy doesn't it suck when something just goes and quits on you!!?

you ass.

how's everything?

dude8383 · « **Reply #6 on:** October 12, 2007, 06:14:57 PM »

Some pics of the tear down:

Is this TDC?

The yummy bits...

What I managed to take out..waiting to the crankshaft locking tool to come in

sheepdog · « **Reply #7 on:** October 12, 2007, 09:01:51 PM »

Those upper sprockets were toast. I am surprised you are not missing rollers from the chain.

Also, were you missing some guides? Seems odd that it wore into the timing chain housing so bad. Or was it driven for a bit after they broke?

But yeah, with those sprockets, only a matter of time.

Also, that mark (interesting) would make sense for TDC. I will check my e36 motor and see if it is. I take it that mark is on the oil filter piece? And if it is TDC, I may have to re-check timing on my motor, not sure it is correct.

cenotaph · « **Reply #8 on:** October 13, 2007, 10:42:30 AM »

are those dual sprockets really necessary? My vr6 only has single upper chain. I wonder if you can delete one.

sheepdog · « **Reply #9 on:** October 13, 2007, 03:19:49 PM »

Metric Mechanic I believe offers a single row.

sports.racer · « **Reply #10 on:** October 14, 2007, 02:27:26 PM »

Quote from: bmwman91;35494

The dial indicator he refers to is not something a lot of people have alying around, and it is not a cheap tool. I say try the luck with a welding rod lol.

Dial indicators don't cost that much.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93051
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=5646
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=623

sheepdog · « **Reply #11 on:** October 14, 2007, 02:40:55 PM »

I would not trust Harbor freight for anything precision, but in this case it should work fine.

sports.racer · « **Reply #12 on:** October 14, 2007, 06:45:52 PM »

Well everyone has an opinion but I rebuilt the engine on the Reynard mentioned in this article about three years ago using HF dials and indicators and the engine is still running fine.

http://www.nationalroadrally.com/sizzler_07.html

dude8383 · « **Reply #13 on:** October 14, 2007, 07:21:05 PM »

Indeed, I replaced them with fresh ones.

I am missing the left guide, which I have replaced as well, I'll try to get some pics of the remaining pieces of the guide.

I was driving when this happened, so I kinda limped it home. I imagine this must have done the damage.

Quote from: sheepdog;35631

Those upper sprockets were toast. I am surprised you are not missing rollers from the chain.

Also, were you missing some guides? Seems odd that it wore into the timing chain housing so bad. Or was it driven for a bit after they broke?

But yeah, with those sprockets, only a matter of time.

Also, that mark (interesting) would make sense for TDC. I will check my e36 motor and see if it is. I take it that mark is on the oil filter piece? And if it is TDC, I may have to re-check timing on my motor, not sure it is correct.

How do I actually use the dial indicator?

I buttoned everything back up, and well...it doesn't good AT ALL.

Strange thing is, it holds idle nice and steady, but there's a metallic noise, kinda like the camshaft lobes hitting the lifters really hard.

I aligned the cams to TDC with the tool, and I did my best to get TDC on the block.

I'm obviously going to tear it down tomorrow again and take a look...

Do you guys have any suggestions?

Is it possible that when the guide shattered, the timing chain skipped a tooth and caused the valves to smack the pistons? I mean...it wouldn't hold idle, would it?

I'm pissed to say the least

dude8383 · « **Reply #14 on:** October 14, 2007, 08:36:11 PM »

Alright, so I found out what it is...I missed TDC by a bit.

Hopefully I didn't do any damage, anyways, here's the pic.

Author Topic: Motor has thrown in the towel (Read 8081 times)

cenotaph