Head Bolt choices - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old February 19th, 2010, 08:50 AM
Antichrist's Avatar
Antichrist
Status: Offline
Tom Rowe
Defender/Disco/Series/MoD
Member
 
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,280
Head Bolt choices

Anyone aware of any serviceability issues with the ProLine head bolts vs OEM?
$59 vs $95
__________________
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old February 19th, 2010, 09:57 AM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
Not sure what you mean by serviceability as they are use-once stretch bolts, but I have used them with fine results. The most important thing is to make sure the threads are very smooth so that your torque is consistent--if they seem rough or uneven at all, I would run them through a thread die to smooth them out.
Reply With Quote
  #3  
Old February 19th, 2010, 10:07 AM
Antichrist's Avatar
Antichrist
Status: Offline
Tom Rowe
Defender/Disco/Series/MoD
Member
 
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,280
I meant do they perform (install/last/not come lose) as well as the OEM.

------ Follow up post added February 19th, 2010 10:23 AM ------

The reason I'm asking is that the head gaskets on my Disco are blown and with 260k on the engine I thought I'd take the 95k mile engine that was in my D90 and put it in my Disco. I thought I'd go ahead and replace the head gaskets while I was switching over all the front cover parts from my Disco that I need to swap to my D90 V8.

(sorry for the additional post, my message edit time has expired)
__________________
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old February 19th, 2010, 03:07 PM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
Yes, very similar on my two trucks (DII and D90). I noticed no difference other than the price.
Reply With Quote
  #5  
Old February 19th, 2010, 03:11 PM
evilfij's Avatar
evilfij
Status: Offline
evilfij
I have never seen a rover in person
Member
 
Join Date: Oct 2003
Location: on the internet
Posts: 14,688
Wait, what year D90? If you have a 1993-95, you have metal gaskets.
__________________
*not legal advice*
Reply With Quote
  #6  
Old February 19th, 2010, 03:13 PM
Hans's Avatar
Hans
Status: Offline
Hans Haase
The D-90.com Lab Rat
Member
 
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,381
Just to ask, before you go through all the work, does the disco have a 3.9 or 4.0? The 4.0 and 3.9 have different length crankshafts, and oiling systems, and the front covers aren't interchangable

-Hans
__________________
My oil line fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
My 100k stopped odometer fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.
Reply With Quote
  #7  
Old February 19th, 2010, 04:28 PM
Antichrist's Avatar
Antichrist
Status: Offline
Tom Rowe
Defender/Disco/Series/MoD
Member
 
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,280
They are both 1995 3.9's.
I ordered an STC1641 head kit (metal gaskets) from TNLR, $49, and a couple of composit head gaskets for $10 each, just in case.
__________________
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
Reply With Quote
  #8  
Old February 19th, 2010, 05:55 PM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
The composite gaskets are thicker (IMHO, superior as well) but they will increase the volume a little of your combustion chamber, so if you want to retain your compression ration (1:9.35, I believe), you might consider milling the surface of the head down the incremental distance (which also trues up your head, too). If I was doing it, I would use the comp gaskets and not put in the outer row of bolts--plenty of info on this site about all that, just search if your interested.
Reply With Quote
  #9  
Old February 19th, 2010, 10:59 PM
huck1974's Avatar
huck1974
Status: Offline
shane cates
94 d90
Member
 
Join Date: Feb 2007
Location: springfield mo
Posts: 890
ARP best bolts made
__________________
I love little baby ducks, old pick-up trucks, slow-moving trains, and rain
I love little country streams, sleep without dreams, sunday school in may,
And hay
And I love you too
Reply With Quote
  #10  
Old February 20th, 2010, 12:35 AM
evilfij's Avatar
evilfij
Status: Offline
evilfij
I have never seen a rover in person
Member
 
Join Date: Oct 2003
Location: on the internet
Posts: 14,688
Bolts are specific to the type of head gasket. I think some of the 1995 discos or maybe even all or most had composite.
__________________
*not legal advice*
Reply With Quote
  #11  
Old February 20th, 2010, 01:42 AM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
I am using arp studs on the engine I am building now--first time using them. comp gaskets.
Reply With Quote
  #12  
Old February 20th, 2010, 07:22 AM
Antichrist's Avatar
Antichrist
Status: Offline
Tom Rowe
Defender/Disco/Series/MoD
Member
 
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,280
Quote:
Originally Posted by evilfij View Post
Bolts are specific to the type of head gasket. I think some of the 1995 discos or maybe even all or most had composite.
Yeah, that's why I ordered composit gaskets too, and am waiting till I get the heads off to make sure, before ordering bolts, but based on the number, I'm 99% sure it's composit
__________________
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
Reply With Quote
  #13  
Old February 20th, 2010, 11:32 AM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
Even if they are metal gaskets currently being used, I would still use composite on rebuild.
Reply With Quote
  #14  
Old February 21st, 2010, 08:26 AM
rover4x4's Avatar
rover4x4
Status: Offline
Phillip
1995 SW #487/500
Member
 
Join Date: Sep 2003
Location: The Old North State
Posts: 7,522
Registry
So no one is still using the old tin gaskets?
__________________
Poor gas mileage gets you to the best places on earth
Reply With Quote
  #15  
Old February 21st, 2010, 11:32 AM
Hans's Avatar
Hans
Status: Offline
Hans Haase
The D-90.com Lab Rat
Member
 
Join Date: Oct 2003
Location: Long Island, NY
Posts: 2,381
Quote:
Originally Posted by rover4x4 View Post
So no one is still using the old tin gaskets?
Very few people, the composites are just that much better. The oil sludge problem mostly comes from the poor seal of the tin head gaskets, combined with the extra row of head bolts that contributes to the leak.
I honestly can't think of any compelling reason to use the tin gaskets anymore.

-Hans
__________________
My oil line fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
My 100k stopped odometer fix

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Brace for impact, I'm in a "modifying mood". Massive thread count inbound.
Reply With Quote
  #16  
Old February 21st, 2010, 02:35 PM
Davis's Avatar
Davis
Status: Offline
Chris Davis
94 NAS D90 6.2LS
Member
 
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
or the first row of bolts...
Reply With Quote
  #17  
Old February 22nd, 2010, 12:22 AM
CDeWan
Status: Offline
Clay DeWan
5.3L beastie
Member
 
Join Date: Feb 2008
Location: Raleigh, NC
Posts: 3,493
The 3.9 in the 94 lasted 260+ with tin gaskets. The engine always had synthetic oil since day one. I had a water pump malfunction that did the motor in and if not for that I know the engine would still be going.
Reply With Quote
  #18  
Old February 25th, 2010, 07:22 AM
Antichrist's Avatar
Antichrist
Status: Offline
Tom Rowe
Defender/Disco/Series/MoD
Member
 
Join Date: Feb 2006
Location: Atlanta, GA USA
Posts: 1,280
Well, I don't know why I'm surprised, but;
The manual says engines without suffix B have tin head gaskets and 14 head bolts.
Engines with suffix B have composite gaskets and 10 head bolts.
Mine does not have suffix B and has a composite gasket and 10 head bolts (and no empty bolt holes).

Is the manual backwards? Or is it possible someone replaced the heads in the past? Will a 10 bolt head even fit a 14 bolt block?
I guess it doesn't matter really, just looking to satisfy my curiosity. I'll be using the composite head gaskets I got.

One other thing. I was thinking of plasti-gauging the big-end and main bearings while I had it on the engine stand, but the manual says if the bearings are removed new ones need to be fitted. Would that be the case even pulling the cap to use plasti-gauge, or do they mean if the shells are removed from the caps?
__________________
Tom Rowe
Atlanta, GA

Four wheel drive allows you to get stuck
in places even more inaccessible.

62 88 Regular
67 109 6cyl NADA x2
74 Lightweight - The Antichrist
95 DI 5-speed
95 D90 5-speed
97 D1 Automatic
Reply With Quote
  #19  
Old February 25th, 2010, 11:35 AM
LRover's Avatar
LRover
Status: Offline
J. Michael McCaig
D90 ST, LR110, Series IIa, RRC
Member
 
Join Date: Oct 2003
Location: VA
Posts: 479
as others have said, it's recommened to leave the outer row of head bolts out to prevent the head from warping and causing the headgasket to fail...that's what is different on the later heads...no holes. I have successsfully used non-stretch head bolts with the composite gaskets. I'm not sure when Rover changed the rod bolts but the ones on my 4.6 were the stretch type as well.
Reply With Quote
  #20  
Old February 25th, 2010, 11:55 AM
evilfij's Avatar
evilfij
Status: Offline
evilfij
I have never seen a rover in person
Member
 
Join Date: Oct 2003
Location: on the internet
Posts: 14,688
Tom, you have what I would expect you to have. edit: i think a 10 bolt head will fit on a 14 bolt bolt, but I have never done that, only the other way around.
__________________
*not legal advice*
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Head Bolt with Alternator Stud, Is It Needed? Grover Defender Technical Discussions 6 October 28th, 2008 12:33 PM
Head bolt torque Bowtracer Defender Technical Discussions 1 September 14th, 2005 11:22 AM
Help with head removal... Trigger Defender Technical Discussions 6 July 12th, 2005 10:56 PM
Some notes on head gasket swap issues Hans Misc. Chit-Chat 0 January 17th, 2005 06:40 PM
bolt head size?(wrench size) mattdh Defender Technical Discussions 3 October 7th, 2004 05:55 PM


All times are GMT -5. The time now is 11:41 AM.


Copyright