WTB long nose camshaft retainer ring - Defender Source
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  #1  
Old March 29th, 2015, 05:25 PM
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Mark Garrenton
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WTB long nose camshaft retainer ring

I need a retainer ring from a distributor fitted V8 (3.5, 3.9, 4.2). It will be a full ring not half moon found on DIS V8s.
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  #2  
Old March 30th, 2015, 02:27 AM
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Dan
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They're available new:

Cam Retainer for 4.0 & 4.6 Rover V8. $39.99

Cam Retaining Collar - Genuine Land Rover at www.rimmerbros.co.uk

You know you need to use a cam that is specifically machined for it?
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  #3  
Old March 30th, 2015, 08:52 AM
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Mark Garrenton
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That looks like the ring but I was under the impression that all 4.0 and 4.6 used a short nose cam (distributorless ignition) and the half moon retainer. My cam looks like the attached. I know someone out there has a dismantled engine with this ring just sitting there too.
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  #4  
Old March 30th, 2015, 09:19 AM
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Kevin Keith
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I thought the distributor engines did not use a retainer ring? My 3.5s did not have one.
I'm sure Mark at D&D fab or Woody at the Wedgeshop would have you if it is needed for your purpose.
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  #5  
Old March 30th, 2015, 12:01 PM
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They didn't, but I've seen some 4.2 blocks already drilled for it and some 4.2 cams machined for it. And not all of the 4.0/4.6 engines used it. I've done a couple conversions and had to drill the holes in the block and machine the cam snout. Not a big deal, it's about a 15 minute job on a lathe. I can't remember where I bought the retainer plates though, I thought I got them for AB but can't find them on their site. Trevor might have them though, or could at least get them.

I have 2001 4.0 with t e slipped liner, I'll have to open it up and see if it has one....

Here's the standard long-nosed, distributor cam that's not machined for a retainer (and from what I can see, it looks like yours in the pic in post #3 is the same)



And here's one that is machined for the ring:



The cam for the half-circle retainers has a groove machined into it. I've never tried using one.
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1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 D90 project
1961 SII
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  #6  
Old March 30th, 2015, 02:42 PM
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Mark Garrenton
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Well, I learned something new today. The cam is actually machined to apply rearward forces as the lifters ride on the lobes. My cam is machined pre 1994 (no retainer plate) so I'm good to go finishing this x-bolted 38a build using the stock fuel injection and a HEI distributor.
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  #7  
Old March 30th, 2015, 02:49 PM
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Yes, that's the idea with all the older non-retainer Rover V8 cams. But many of them still can develop cam walk, where the cam shuffles back and forth in the block at idle causing an annoying but harmless knock. None of mine do it, but I have a friend with a low-mileage '92 RRC that does it and he's been on the verge of swapping in a cam retainer for quite some time now. I'm building up a 4.2 for my '91 RRC and I'll be running a retainer plate in it just for peace of mind.
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1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 D90 project
1961 SII
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  #8  
Old March 30th, 2015, 03:08 PM
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Mark Garrenton
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It occurred to me that I used to install thrust buttons into the timing covers of small block chevy engines to prevent that many years ago. There are also Teflon button bolts for these V8s.
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  #9  
Old March 30th, 2015, 05:09 PM
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Yes, I thought of trying them but I heard from several sources that they don't seem to hold up well on these engines. They tend to crack and fall out.
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1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 D90 project
1961 SII
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  #10  
Old March 31st, 2015, 12:52 PM
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Mark Garrenton
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Yesterday I noticed that the is a protrusion on the backside of the timing cover (with distributor hole) that should line up with the cam bolt. It appears that it may be LR's built-in answer to cam walk.
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  #11  
Old March 31st, 2015, 02:04 PM
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Yes, it is. But it still allows the cam to move back and forth a fair bit. In some cases, the chunking sound of cam walk is the timing gear hitting that protrusion.
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1991 RRC 4.2, R380, LT230, TrueTrac, Detroit, sliders, 33s, blahblahblah....
1994 RRC LWB
1994 RRC SWB
1995 D90 project
1961 SII
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