Oil leaking from head gasket!

[posplayr]

PO approach

I'm just glad that I probably won't have to have the head welded and have the thread retapped. When I originally saw the goop, I assumed that a PO had tried to remove the head in the dark and had forgotten/not seen the lower bolts and broke off or otherwise stripped the head bolt.

I'm relieved as it must just be a quick fix for the old O ring (#17) which also means the motor is probably original and not bored. If the compression test is good then the motor probably just has high "HIWAY" miles.

Posplayr

[tfb]

Wow, I guess this link does a pretty good job of explaining this:

http://www.posplayr.100megsfree3.com..._head_bolt.jpg

Mate, that's one of the ugliest repairs I've seen in a while!

[posplayr]

Tbf

Just so I got this right by replacing the two front center o-rings on two front center bolts (under the valve cover) bolt #10 should stop leaking?
In the manual these two O-ring bolts are labled as "B"

By the way the goop was on the GS1100 which I saw when I bought it is partially the reason I think I got it for $1300. It now appears that I'm in luck as the PO simply did not know why it was leaking and figured a head gasket was in order. Ironically if it is the 0-rings then even if he had gone to all the trouble of pulling the head, then the 0-rings would still leak.

Posplayr

[tfb]

Just so I got this right by replacing the two front center o-rings on two front center bolts (under the valve cover) bolt #10 should stop leaking?

If it is the O-rings, then the oil will run down to the front of the engine, and drip off bolt #10, or thereabouts.

[posplayr]

tfb

Any comments on my compression test results?

http://www.thegsresources.com/_forum/showthread.php?t=119140

[tfb]

Compression figures look v. healthy to me, 100psi is traditionally the lowest acceptable figure. #4 is a bit high in relation to the others (the more even your compression figures the better), but not much you can do about that.

[posplayr]

Compression Test

I will redo the test once she is running again and gets a little warm. I'm thinking with 49K miles this thing has been stepped up to 10.25:1 or 10.5:1 new pistons. Sunburn is the one with the 13.5K miles bike. \\/

This is a new tester and when I used it on my 1981 GS70E I got lowest 145 up to 165 on compression. Manual calls out 171 max.

I did find a problem though. See pictures

All the cam lobes look redone, chain streach is 157mm (v.s. 175mm service limit) so it is tight.

http://www.posplayr.100megsfree3.com/gs750/gs1100E_cams.jpg

Here is the problem Tach did not work, gauge works , tach drive gear is so-so but the gear on the exhaust cam is crap!!!!

http://www.posplayr.100megsfree3.com/gs750/gs1100E_speedo_gear.jpg

I assume there is nothing to do but look for a new cam and hope all is original.

Posplayr

[Sunburn]

I assume there is nothing to do but look for a new cam and hope all is original.

Posplayr

New cam i think you have to replace everything that comes in contact with it or you get premature wear. Someone here should know more about that then I.


P.s. did my thread get jacked? LOL, it's cool I got the help I needed. I looked over your compresson thread, very interesting.......keep going i'm enjoying it. :-D

[Sunburn]

I'll bet it's perished O-rings that reside around the inner pair of front head bolts. Go to here on AlphaSports and part# 17 is the one that you'll need to replace.

You'll need two of those rubber rings, one for each nut. 8-[

Ya, it's been 9 months but I went with replacing the O-rings and it's been 50 miles without a drop. Done deal.

Thanks for the input.


Mark

[posplayr]

Sunburn

Glad all is well. You getting any ridding in those 9 months?
Get the oil cooler fittings resolved?

Posplayr

[tfb]

Good news it was just those pesky O-rings!

[Sunburn]

Glad all is well. You getting any ridding in those 9 months?
Get the oil cooler fittings resolved?

Posplayr

No and Yes.


Planned a long ride this week end when I noticed my insurance expired on 9/16. Forgot to mail the check. Sending it today!