Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

Quick questions. Rear main seal

Started by rodomo , Nov 22 2010 08:00 PM

Please log in to reply

8 replies to this topic

#1 rodomo

To advertise here, call 13TORANA

Members
18,026 posts

Name:R - O - B Dammit!
Location:Way out west of Melbourne Awstraylya
Joined: 10-December 05

Posted 22 November 2010 - 08:00 PM

Did early reds (149,161,179,186) all have rope seals?
Was the neoprene seal introduced with 173 & 202?
Am I correct that 173 and 202 had both at different stages?

Edited by rodomo, 22 November 2010 - 08:04 PM.

Back to top

#2 _judgelj_

Guests

Posted 22 November 2010 - 08:57 PM

i think it was the early reds that had the rubber seal similar to rope. then neoprene was introduced later on, with the rope being available in some red 202's from the hq. maybe someone can add to this?

Back to top

#3 rodomo

To advertise here, call 13TORANA

Members
18,026 posts

Name:R - O - B Dammit!
Location:Way out west of Melbourne Awstraylya
Joined: 10-December 05

Posted 22 November 2010 - 09:40 PM

Back to top

#4 _judgelj_

Guests

Posted 22 November 2010 - 11:16 PM

are they both red 202's? the one on the right is probably a hq motor

Back to top

#5 S pack

Scrivet Counter

Members
15,667 posts

Name:Dave
Location:Luggage Point
Car:73 LJ
Joined: 25-January 10

Posted 23 November 2010 - 12:26 AM

Did early reds (149,161,179,186) all have rope seals?
Was the neoprene seal introduced with 173 & 202?
Am I correct that 173 and 202 had both at different stages?

Hi Rob,

AFAIK the 138,149,161,179,186 have rope rear main oil seals. The LC workshop manual describes how to replace the Rope oil seal. All Rope seal crankshafts have the hatching around the seal journal.

I can't say with any certainty if early 173 and 202 had rope seals, I thought they always used a Neoprene seal.
There is more than one type of neoprene seal. Additional to the one in your pic, GMH also used a neoprene seal that fitted into a groove similar to that for a rope seal and I have also read about a double lip neoprene seal being tested in service.

In 1973 GMH engineering department also experimented with a run of 25,000 engines comprising of 6cyl & V8's utilising a rear main oil seal made from Chicago Rawhide.

It seems that eventually GMH reverted back to the rope seal for the blue and black motors and possibly before the red motor was discontinued.

Cheers
Dave

Back to top

#6 yel327

Oh My, Don't you post alot

Members
13,573 posts

Joined: 10-February 08

Posted 23 November 2010 - 04:46 AM

Rope started around mid-late HQ. From then onwards all red, blue, black 6cyl, 253 and 304/308 were rope seal. Of all the earlier 6cyl engines I have ever played with (EH-HG) they have all been neoprene. Early 253 and 308 from HT release were also neoprene.

Back to top

#7 rodomo

To advertise here, call 13TORANA

Members
18,026 posts

Name:R - O - B Dammit!
Location:Way out west of Melbourne Awstraylya
Joined: 10-December 05

Posted 23 November 2010 - 03:50 PM

There is more than one type of neoprene seal. Additional to the one in your pic, GMH also used a neoprene seal that fitted into a groove similar to that for a rope seal and I have also read about a double lip neoprene seal being tested in service.

Yes, I remember that seal that replaced the rope. 1st wifeys HQ had that. We had to change the crank because of the soft thrust face. (Manual)
I don't have a pic though.

Bit of a balls up really if you look at the big picture. They should have just modded the flywheel flange and the block to accept a 1 piece seal.