Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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Bland
Tim Bland
Oregon
(7 posts)

Registered:
01/22/2017 11:15PM

Main British Car:
1980 Triumph TR8 Rover 3.5

authors avatar
Re: Rover 4.6 V8 Triage
Posted by: Bland
Date: July 23, 2018 02:22PM

Amendment to my previous post.

After further checking I have two Rover blocks and not a Buick block.


turbodave
dave cox

(13 posts)

Registered:
04/30/2018 03:00PM

Main British Car:


Re: Rover 4.6 V8 Triage
Posted by: turbodave
Date: July 30, 2018 10:35AM

These vids I took say it all...

[www.youtube.com]

The Later 4.6's seem to have the "loose liner syndrome" (not to be confused with "cracked block behind liner" or the earlier "dropped" liner issues). These are simply that there appears to be insuffient interference, especially on the centre four liners, for the liners to hold in place, especially at higher temperatures.
Pinning is the easy fix for what is otherwise a plenty servicable engine. If you do proceed, I'd go ahead and simply pin them all anyway, as its so easy to do with the engine on the bench, in pieces.

The "first 6 month production" 2003 4.6's had the well known issue of the dowel holes in the block for the front cover being machined in the wrong place (interestingly the bolt holes and even the countersinks for the dowels were right, someone just mistakenly offset the dowel holes). This is easy to see as the pump gerotor is likely broken when you pull it out, and ALL the bolts are biased to one side in the holes in the front cover. Fix for that is to simply pitch the dowels, align manually such that the gerotor gear "floats" and can be slid forwards/backwards using a magnet thru the oil seal, and drill a few 1/8" holes and knock in a couple of roll pins for holding that location. Just because it came out of an '04, don't assume it was an '04 motor. You'll see the countersink offset around the dowel very easily if it is there. If it looks ok, it is ok.


turbodave
dave cox

(13 posts)

Registered:
04/30/2018 03:00PM

Main British Car:


Re: Rover 4.6 V8 Triage
Posted by: turbodave
Date: July 30, 2018 10:39AM

Finally, if you do pressure test the block, I recommend setting the block on your grill, and warming it up, at least to 180 deg. If it doesn't leak at that temp, you've definitely got a goodun.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5567 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Rover 4.6 V8 Triage
Posted by: BlownMGB-V8
Date: August 01, 2018 10:22AM

Loctite should fix that also.

Jim


roverman
Art Gertz
Winchester, CA.
(2899 posts)

Registered:
04/24/2009 11:02AM

Main British Car:
74' Jensen Healy, 79 Huff. GT 1, 74 MGB Lotus 907,2L

Re: Rover 4.6 V8 Triage
Posted by: roverman
Date: August 01, 2018 08:08PM

Warning: If you convert to head studs, reduce your torque # by 30% ! 20 tpi vs 14 tpi. Just about any cast aluminum thread will fail,if 30% too much torque is applied . FWIW, roverman.
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