Wap, wap, wap. Options

[Bee Jay]

I didn't make the WCC because of this sound coming from the engine compartment. It didn't get louder when we plugged the tailpipe. I ran a compression check this weekend. Cylinders 1,2 & 3 were 100lbs +- 5%, but number four was only 50lbs. OK, the head is either cracked or the head to piston seal is gone. There are only 4K miles on the engine since Wayne Dempsey, Tom Gould and I built it in 2000. There was a lot of debate at the time on whether or not to include the copper "head gasket" and the popular advice was to leave it out. Am I to regret that decision? My 3.0 motor isn't ready, I haven't even started tearing it down yet, so I guess I need to drop this 2.0 liter, and repair the head leak, if I want to drive it this summer.
Bee Jay
My car:
http://www.picturetrail.com/gallery/view?p...2754&uid=598455

[Allan]

I remember hearing it at Crusty's place. Everybody seemed to have a different opinion as to what it sounded like. I never said anything but it does sound like a head leak. I left the head gaskets out of mine and so far so good.

Oh by the way, way bitchin car!!!

[r_towle]

if its head to cylinder, then you need to make sure those surfaces are lapped correctly prior to final assembly...otherwise it will happen again.

the machining is very important that the cylinder to head and cylinder to case connections.

These must be square and flat...then lapped.

Good luck

No gaskets if done correctly.

Rich

[Cap'n Krusty]

If your machinist does the job right, why would you want to introduce the random uneveness of lapping the heads? He uses years of experience, and a real expensive and real precise vertical milling machine. Costs and weighs more than your car. You use your hands, tools not known for their precision, nor the repeatability of the results. As for leaving out the head gaskets on an engine designed to use them, I fail to see the benefits. Porsche decided to leave them out of the 964 motors, BY DESIGN, and it has been a nightmare for both them and the car owners. VW took them out of their 2 litre heads, but they also lowered the compression, redesigned the heads, and added an EGR system in an attempt to keep the combustion temps down. Didn't work, BTW. The Cap'n

[Dave_Darling]

VW also told their mechanics to leave them out of every Type IV engine that came in and had the heads off...

--DD

[ArtechnikA]

QUOTE (Dave_Darling @ Apr 25 2005, 09:09 PM)

VW also told their mechanics to leave them out of every Type IV engine that came in and had the heads off...

yes they did; i've seen the service bulletin.

it also says to use a shim of comparable thickness under the cylinder to restore the deck height...

[Bee Jay]

Well, I tried without gaskets and look what happened. So I think I'll give gaskets a try. Cracked head or bent valve is a possibility also. I won't have time to drop the engine for a couple of weeks.
Bee Jay

[Cap'n Krusty]

QUOTE (Dave_Darling @ Apr 25 2005, 06:09 PM)

VW also told their mechanics to leave them out of every Type IV engine that came in and had the heads off... --DD

Not in the manual, and I haven't seen a TSB to that effect. Might be one, mind you, but I've never seen it, and the guys who do my headwork never heard of it either .................... The Cap'n

[davep]

Could someone post the SB please.

[MarkV]

Here is the link to the service bulletin:

http://www.dolphinsci.com/techbull.html

[ArtechnikA]

okay - *this* time i have it bookmarked so i have a chance of finding it the next time the question comes up.

this is also the "oil squirter connecting rod mod" TSB...

[Bee Jay]

I got the head off. Here is a pic of the head. Surprise, I did put the gaskets in. The one on the right failed. Now I have a burn hole in the head. I hope it can be repaired with welding. I guess I will try without gaskets next.
Bee Jay
http://www.picturetrail.com/gallery/view?p...2754&uid=598455

[redshift]

Sorry man... NICE CAR!

(IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

Damnit.


Miles

[echocanyons]

So since you have the heads off was there piston clearance issues?
The valves look pretty clean

[scotty914]

suburize it

[Joe Ricard]

So I was playing with this stuff called "alumalloy" (sp)
Anyway it is a method of technically speaking soldering aluminum. It is not welding but once the stuff is heated and bonded you can't re-melt it with the propane torch used to get liquid the 1st time.
Some sort of Mechanical process to make the Alumalloy rod once it is heated the two parts alloy and are pretty tough.

Generally accepted method is welding. But you better find somebody that welds aluminum everyday. Get the head too hot and you will have a pile of junk.

[Dead Air]

Great car!! (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif)

We can't seem to let this head gasket thing go, can we? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

[rhodyguy]

mr b.e. jones i take it? i still have your card.

k

[aircooledboy]

As the Cap'n has pointed out over and over, that SB does not appear to apply to our engines (unless you are running a bus engine that was remanufactured and modified after May 31, 1990). (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

QUOTE

Subject: VWC Remanufactured 2.0l Air-Cooled Engine Group: 10 Number: 10-90 T01 Models(s): Type II/Vanagon 1975 - 83 MY Date: May 31, 1990 -------------------------------------------------------------------------------- Engines, P/N 071 100 031AX, 039 100 031 B/C/DX, have been modified to improve heat transfer an increase durability. These changes effect Engine codes: GD, GE, CV. The following improvements have been introduced as of remanufactured Engine number 89000.

[tat2dphreak]

man, that car is way cool man! I dig the little touches, like the S2000 button... cool! (IMG:http://www.914world.com/bbs2/html/emoticons/smilie_pokal.gif)