S4 Heat Shield Mounting Points - Alfa Romeo Bulletin Board & Forums
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post #1 of 17 (permalink) Old 01-10-2014, 02:18 PM Thread Starter
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S4 Heat Shield Mounting Points

Hello All,

I tried searching but couldnt find any pictures.

I have a '91 Spider that does not have the Exhaust manifold heat shield.

I believe that the shield was installed when cable throttle was introduced on the manual cars and all automatics.

Last year I converted to cable throttle and bought a used heat shield.

My challenge is that my exhaust manifold does not have the 2 studs that the shield gets attached to.

I plan on drilling and tapping my manifold but would like to see what the factory did.

Can someone post some pictures of the exhaust with the studs and without the shield on?

Can someone post some pictures of the assembly or is it just the shield sitting on the studs and a nut to hold the shield in place?

Lastly, can you tell me the length of the stud sticking out of the manifold?

Thanks,

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #2 of 17 (permalink) Old 01-10-2014, 03:09 PM
But Mad North-Northwest
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Man, I wouldn't risk drilling the manifold for that crappy little heat shield.

Thermo-tec makes a header blanket that'll work just as well, if not better, and is pretty easy to install. Unlike header wrap it's safe for cast manifolds, just suggest you leave the underside uncovered so the pipes don't get too hot.

Thermo-Tec : Header Manifold Blanket

It's a little mickey-mousey to install since it needs to be cut to size and just goes on with clips and wire, but it'll be a hell of a lot easier and safer than drilling. Just my suggestion.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #3 of 17 (permalink) Old 01-10-2014, 07:38 PM Thread Starter
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Quote:
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Man, I wouldn't risk drilling the manifold for that crappy little heat shield.
For fear of cracking the manifold?

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #4 of 17 (permalink) Old 01-10-2014, 07:55 PM
But Mad North-Northwest
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Yeah, just for fear of weakening it or damaging it. I mean, I don't have a lot of experience with drilling holes in headers, but my gut tells me to avoid it if there's an easier way. A blanket will do the same thing and is safe and reversible.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #5 of 17 (permalink) Old 01-10-2014, 10:08 PM
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Heat shields have been held on for years with hose clamps. fwiw

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post #6 of 17 (permalink) Old 01-11-2014, 01:08 AM
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Hi Vin,

Pictures below. The heat shield on the Automatic is off at the moment for various reasons.

The stud on the right is original. The one on the left replaced a sheared original. The garage that put the non-original in drilled out the old stud but went right through so I have to make sure the hole is sealed.

The metal is not very thick there so its easy to drill too far.

Nick
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Spider S4 1990 manual red LHD
Spider 916 V6 2002 Silver

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post #7 of 17 (permalink) Old 01-11-2014, 01:32 AM
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Nick,
the parts diagram shows little spacers of some sort too that fit over the threaded studs (size of studs?), between manifold and heat shield.....photo of those would be good too, if you'd be so kind!
Dom

Edit: thanks as ever! Is the spacer on the original (#4) stud separate? the diagram kind of suggests it as such, but is not terribly clear, as it shows a stud and the spacer sort of separate...
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Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.

Last edited by spiderserie4; 01-11-2014 at 07:07 AM. Reason: added diagram
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post #8 of 17 (permalink) Old 01-11-2014, 06:58 AM Thread Starter
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Quote:
Originally Posted by radamm View Post
Heat shields have been held on for years with hose clamps. fwiw
radamm,

Do you mean the original heat shields or the blanket style Gubi suggested?

Thanks,

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #9 of 17 (permalink) Old 01-11-2014, 06:59 AM Thread Starter
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Quote:
Originally Posted by AngloSpider View Post
Hi Vin,

Pictures below. The heat shield on the Automatic is off at the moment for various reasons.

The stud on the right is original. The one on the left replaced a sheared original. The garage that put the non-original in drilled out the old stud but went right through so I have to make sure the hole is sealed.

The metal is not very thick there so its easy to drill too far.

Nick
Hello Nick,

Brilliant!

Thanks,

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #10 of 17 (permalink) Old 01-11-2014, 07:25 AM Thread Starter
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Hello All,

Msiert was good enough to send me a picture of his manifold while it was the bench and it shows what I thought and Anglospider has pointed out.

The bosses on the 2 and 4 where the studs go are raised. I would imagine to allow enough material to be drilled and tapped without going through.

Name:  Replacement manifold.jpg
Views: 624
Size:  66.3 KB

Oh well, choices, choices. Decision time.

Thanks to all.

Let you know how I make out.

Vin

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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Last edited by Vintre; 01-11-2014 at 07:28 AM.
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post #11 of 17 (permalink) Old 01-11-2014, 08:34 AM
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Vin, you're welcome. If you don't have the appropriate headers with raised boss maybe you could weld bolts on, with the head of the bolt welded to the boss?

Dom, the spacer on the stud on #4 is original. The stud labelled 11 on your diagram is a naked stud (hmmm, where have I seen that phrase before....) whereas the one labelled 10 has what appears to be, on my car, a brass nut which acts as the spacer. I assume they are separable.

Spider S4 1990 manual red LHD
Spider 916 V6 2002 Silver

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post #12 of 17 (permalink) Old 01-11-2014, 08:52 AM
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its interesting to see the extra higher raised boss on #2 & #4 in Vin's photo (Msiert's photo)....the parts catalogue actually gives 4 separate part numbers for the two 'twin branches' of the manifold....I guess a heatshield manifold and a non- heatshield manifold.

And yet, Nick, your bosses look normal height, like mine (a non heatshield S4, although #4 boss on mine actually has a hole, just not tapped!!), but yours has always had a heatshield I believe?

odd!

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.

Last edited by spiderserie4; 01-11-2014 at 08:55 AM.
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post #13 of 17 (permalink) Old 01-11-2014, 09:24 AM
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Quote:
Originally Posted by Vintre View Post
radamm,

Do you mean the original heat shields or the blanket style Gubi suggested?

Thanks,

Vin
I was just speaking in general. If you developed a stud system to mount an original shield , or any other, to the manifold, it could be securely held by hose clamps around the manifold in some fashion. The screw type hose clamps are usually stainless steel and long lasting. Just an option that does not modify the original manifolds.
(and no leak worries, sorry.. couldn't resist)

__________
Rick

MEMBRO LATO OSCURO


69 850 Spider (A fond college days' memory)
81 Spider Veloce
Downstate Illinois SNO Director

Last edited by radamm; 01-11-2014 at 09:37 AM.
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post #14 of 17 (permalink) Old 01-11-2014, 08:24 PM
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This mod is one I felt was worth it.

Not only is it a heat shield to keep the heat away from the brake lines and master cylinder it also ties the #4 runner together with the #2 runner, which in my opinion helps keeps the #4 runner from cracking as it's know to do.

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Last edited by msiert; 01-11-2014 at 08:27 PM.
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post #15 of 17 (permalink) Old 02-14-2014, 10:10 AM
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looking at this picture of a motronic engine, I am thinking one could fabricate something to attach to those 2 (unused?) bolt holes in the cam cover? (well, for us S4 owners with the old throttle rod set-up at least, as I think one hole (both?) is taken up by the cable throttle attachments on later S4s).....thus doing away with the need for the correct manifold with the mounting studs?
just an idea
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Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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