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

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donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Rover Lifter Preload
Posted by: donkelly23
Date: August 04, 2016 03:47PM

As noted I am trying to set my preload on my 4.0. My initial measurement of #1 cyl. using the wire feeler gauge method was bigger than the wire measuring tools I have.
So I created an aluminum shim measuring .036 and installed 4 on the odd bank.
Here are my numbers
All numbers w/o the 0 in the front
52/52 37/32 32/3/ 35/23
Then installed those shims on the even side
55/52 18/42 52/56 32/46

Using brand new dry lifters and brand new push rods (Smith Bros) The rocker assembly is stock from an 80 TR8.
What could cause such radical numbers.
Was told to add up the banks to get an average on each side and then figure what I would need to equal about .034 (Number differed by everyone)

Would appreciate the feedback as I am a duface when it comes to all things valve train


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Rover Lifter Preload
Posted by: BlownMGB-V8
Date: August 05, 2016 09:40AM

I'd go for the .040-.080" range myself. Less chance of lifter tap.

Jim


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 05, 2016 10:02AM

Books say 20-60

So maybe go higher average than the 34


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6468 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Rover Lifter Preload
Posted by: BlownMGB-V8
Date: August 05, 2016 11:39AM

I normally shoot for .060"


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 05, 2016 01:52PM

Swapped the rocker assemblies and this is what i got.
Remember .036 shim under assemly

New
Even- 18/22 54/34 37/32 52/42
Odd- 36/42 22/42 18/36 56/42


mstemp
Mike Stemp
Calgary, Canada
(222 posts)

Registered:
11/25/2009 07:18AM

Main British Car:
1980 MGB Rover 4.6L

Re: Rover Lifter Preload
Posted by: mstemp
Date: August 05, 2016 03:20PM

Don,

Who did your heads? A properly set up head should have all valve heights the same should it not? So in theory the clearances should also be the same unless the rocker arms are worn in varying arrays.


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 05, 2016 05:17PM

That what perplexes me
The heads were done by Woody and have about 600 miles on them over 4 years.
The rockers are stock TR8 ones with 100K about on them
New lifters and push rods.
The cam is the same age as the heads and the block is brand new



donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 05, 2016 06:12PM

OK
Here's an old one.
You guys must be as old as dirt
[forum.britishv8.org]


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 06, 2016 09:30AM

Just for my understanding...
Why was this moved?

Here's the Forum title

engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)
It is an engine swap and it is a Triumph Sports car


Moderator
Curtis Jacobson
Portland Oregon
(4576 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: Rover Lifter Preload
Posted by: Moderator
Date: August 06, 2016 11:24AM

If this thread were about how to make a Rover engine fit inside a Triumph, it would belong in the Triumph section. For example: "What Rover engine mounts, or headers, or radiator hoses work best in a Triumph chassis?" Putting this thread in the engine section welcomes participation from everyone with an interest in Rover engines or valvetrain set-ups.


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 06, 2016 03:20PM

Thanks Curtis


donkelly23
Don Kelly
Charleston, SC
(130 posts)

Registered:
07/21/2011 05:13PM

Main British Car:
1980 TR7 V8 Z28 FI ECM 4.0

Re: Rover Lifter Preload
Posted by: donkelly23
Date: August 07, 2016 02:14PM

Huston, I think we have a problem.
I need you fine experts to let me know if I do.
I was told that I should use a straight edge to measure across my valves and springs to make sure they are level.
So Since I am working the even side of the engine I pulled the rockers< again, and layed my framing square across the top.
Yikes.
The exhaust valve (I think), is a lot higher than the rest.
With the edge on# 8-4 I have .016 on the outside valve on 2
When I reverse the edge and lay it on 2 & 4 I have like .04 on the outside valve on 8.
What says you all??


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