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weaves
09-01-2008, 05:08 PM
1991 318I

Here's the story:

I bought this car and as i was driving home i noticed the temp gauge was acting funny. I pull over and check the car if it was over heating. Tubes going In and out of the engine were still cold.

Figured the gauge is faulty. I turn on the hot air as a precaution, although im not getting any hot air. I'm driving home i hear a tick from the engine bay, I pull over, car is smoking, yikes*smoke*

I get it towed to where im storing it.

Today i finally have time to look at it. I thought i might of done some serious engine damage... started the car drove around, 1st, 2Nd gear nothing over 3k. no knock. car is still getting pretty hot.

Do a compression test, im gettting (1st cylinder closest to the rad.)

1. 190
2.170
3.175
4.200

So i change the oil, looking for any metal fragments or antifreeze, nothing.

Did i warp my head alittle, blow the headgasket?

Back to the overheating... i figure it was a stuck thermostat. i get everything off, and to my surprise there is no damn thermostat, wtf? so i put one in, top the rad back up.


I started the car with the rad cap off, bubbles come out, system has no air bubles

Car still overheats...

water pump dead??? that would explain no heat in the cabin, but if there were bubles coming out wouldnt that mean the pump was working?

What are your thoughts? S

Sorry for the long post.

O where is the best place to get a new pump in the east end??

Cheers,

Derek.

weaves
09-05-2008, 11:29 AM
Anyone know where i can get a water pump????? other then BMW, they want 200 bucks for one :(

everlast
09-05-2008, 12:35 PM
http://www.autopartsway.ca/ is a great site

$80, free shipping:
http://www.autopartsway.ca/autoparts2/index.cfm?fetch=part~ID=1991~BMW~318i%20Sedan~2409 52

El Gato Liso
09-05-2008, 12:41 PM
http://www.autopartsway.ca/ is a great site

$80, free shipping:
http://www.autopartsway.ca/autoparts2/index.cfm?fetch=part~ID=1991~BMW~318i%20Sedan~2409 52

exactly where my e30 water pump came from! good service!!!

oh yes the e30 water pump replacement CAN be tricky

weaves
09-05-2008, 12:57 PM
Tricky, how so?

Couple of things...

Do i need any other items, gasket??

There are two there, im getting the first one right $80.88?

and,

"Must also replace (3) 07 11 9 904 527 hex bolts with washers"

Do i have to buy new bolts and washers why cant i re use them :S

Thanks for all the help :D

El Gato Liso
09-05-2008, 01:23 PM
Tricky, how so?

Couple of things...

Do i need any other items, gasket??

There are two there, im getting the first one right $80.88?

and,

"Must also replace (3) 07 11 9 904 527 hex bolts with washers"

Do i have to buy new bolts and washers why cant i re use them :S

Thanks for all the help :D

you do need a gasket!!!
it should come with one, but order like 2 more just incase...when i did mine i ****ed up 2 gaskets, but got it the third time.
you CAN also use that sealing silicon instead, but i used both. better be safe than sorry ;)

you CAN reuse the bolts! i did. but DONT over tighten it. when it stops spinning leave it.. i broke a bolt in the motor block and had to get it retapped.

and the most tricky part is if you're using a gasket which i highly recommend, is there is this pin with a spring that needs a decent amount of force to hold in place when putting the water pump in. lining up the pump to the holes is also tricky. best thing you can do is get a bolt to at least hold it to the motor, then pop it in linning the hole and bolt it up voila!

http://img237.imageshack.us/img237/1452/waterpumpho3.jpg (http://imageshack.us)
http://img237.imageshack.us/img237/1452/waterpumpho3.33b5e2d13c.jpg (http://g.imageshack.us/g.php?h=237&i=waterpumpho3.jpg)

and no i did not change the timing belt. no need to. unless its REALLY showing that it needs to be change


mega edit: 318i...i dont know if its the same sorry :(

everlast
09-05-2008, 02:12 PM
^^^^ IGNORE ALL THAT.

OP has an M42 motor, not M20. No timing belt change needed, not sure what else you'll need. You should at the very least have a Haynes manual at your side or a walkthrough from the web.

I've reused bolts, but get new ones if it says to. They're like $2.

everlast
09-05-2008, 02:15 PM
Also, when doing the water pump with an M20, you should probably never reuse an old timing belt no matter how new because they stretch on first application to the right length.

M20 = new water pump, timing belt and tensioner every 4 years, period.

Aveman
09-05-2008, 03:09 PM
While the car is idling do you see air bubbles constantly coming out at the coolant reservoir?

weaves
09-06-2008, 02:12 AM
not constantly but there were some bubbles coming out. i basically took one of the plumbing lines off and started the car, nothing came out.

So to confirm i have a 1991 318IS, with a M42 motor??? and that the $80 pump will fit, gasket comes with?

Aveman
09-06-2008, 02:45 PM
not constantly but there were some bubbles coming out. i basically took one of the plumbing lines off and started the car, nothing came out.

So to confirm i have a 1991 318IS, with a M42 motor??? and that the $80 pump will fit, gasket comes with?

Ok I was asking because one way to indicate a blown head gasket is if you see bubbles coming out of the coolant bottle after the systems has had a few mintues to bleed. It would mean the compression from the engine is leaking into the coolant system which would cause air to build up in the system and eventually an airlock would occur.

Maybe the previous owner was trying to mask a head gasket issue by removing the thermostat to buy more time before the car would overheat?

Wouldn't hurt to put a new water pump in and thermostat and properly bleed the system. Fill coolant right into the block through the rad hose and open the bleeder on the thermostat housing.