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Type 4 fan shroud fasteners
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soloyosh
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PostPosted: Fri Jun 11, 2021 9:34 am    Post subject: Type 4 fan shroud fasteners Reply with quote

Hi all,

I was working in the garage last night on our new-to-us 1800.

The fan shroud we have seems to be missing a number of fasteners. I forgot to bring them to work to order them. I remember they were M6 but can anyone confirm the length of 29 and 31 in the view below?

Image may have been reduced in size. Click image to view fullscreen.


Thank you
Brett and Aaron
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obieoberstar
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PostPosted: Sat Jun 12, 2021 5:41 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

I believe #29 is M8. Unsure of the length of the M6 and M8 fasteners on that shroud.
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ivwshane
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PostPosted: Sat Jun 12, 2021 7:34 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

This is what I found (from the general forum in the hardware sticky).

ivwshane wrote:
I've never been to this part of the forum but hopefully this info helps.

This applies to a 77 type IV engine but it could cover other type IV model years.

Sizes are either exact or the closest sizes currently available new. Most hardware can/was purchased from boltdepot, belmetric, and fastenal.

Nuts and bolts
Clutch pressure plate
- 8mmx18.5mm 1.25 @6 hex tap
Engine mount
- 8mmx20mm 1.25 @4 serrated flange (fastenal #11115901)
Plenum-case mount
- 8mmx83?mm 1.25 @2 hex tap
EGR
- 6mmx10mm 1.0 @2 pan head
EGR valve
- 6mmx16mm 1.0 @2 hex tap
EGR valve to plenum
- 6mmx55mm 1.0 @2 Allen head cap
Throttle body
- 6mmx25mm 1.0 @2 pan head
EGR/exhaust
- 8mmx30mm 1.25 @2 hex tap
Heat exchanger left
- 6mmx14mm 1.0 @1 serrated flange (fastenal # 11115895-16mm # 111115894-12mm)
Booster fan
- 6mmx15mm 1.0 @2 hex tap
Fan guard
- 6mmx14mm 1.0 @1 serrated flange
Alternator bracket
- 8mmx18mm 1.25 @2 hex tap
Fan housing
- 6mmx20mm 1.25 @8 pan Phillips
- 8mmx16mm 1.25 @1 hex tap
- 8mmx45mm 1.25 @2 hex tap
- 8mmx45mm 1.25 @1 hex
- 8mmx30mm 1.25 @3 hex tap
Starter bolt
- 10mmx70mm 1.5 @1 hex
Exhaust EGR side
- 8mmx30mm 1.25 @2 hex tap
- 8mmx20mm 1.25 @1 hex
Engine carrier bolts
- 8mmx65mm 1.25 @4 hex
Bumper
- 10mmx25mm 1.5 @4 hex tap
Fan hub
- 8mmx30mm 1.25 @1 serrated flange
Transmission (fastenal # 11115903)
- 10mmx75mm 1.5 @1 hex
Transmission mount
- 10mmx45mm 1.5 @2 hex
CV bolts
- 8mmx48mm 12 point


Cooling tin
- 6mmx12mm 1.0 @1 hex tap (fastenal # 0128747)
Cylinder cooling tin
- 5mmx12mm 1.0 @2 hex tap (fastenal # 1138543)
Oil temp plate
- 6mmx10mm 1.0 @2 hex tap (fastenal # 11113804)
Valve lifters
- 7mm nut @8 (fastenal # 0161929)
- 6mm square nut @4 (fastenal # 0161910)
Thermostat
- 8mmx10mm 1.25 @1 hex tap (fastenal # 11552374)
Engine case top
- 8mmx45mm 1.25 @1 hex
- 8mmx88mm 1.25 @1 hex
- 8mmx93mm 1.25 @1 hex
Alternator tin
- 6mmx30mm 1.0 @1 hex tap (fastenal # 0153965)
Control flaps cable holder
- 4mmx8mm @1 hex tap (fastenal # 0162373)
- 4mm square nut
Fan housing cooling flaps (non stock item and a mod to keep flaps from falling off)
- 1/8" spring e-clips x4 (fastenal # 0401249)

Stud length for cross over pipe
28.5mmx8mmx1.25

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soloyosh
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PostPosted: Mon Jun 14, 2021 2:22 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

ivwshane wrote:
This is what I found (from the general forum in the hardware sticky).

ivwshane wrote:
I've never been to this part of the forum but hopefully this info helps.

This applies to a 77 type IV engine but it could cover other type IV model years.

Sizes are either exact or the closest sizes currently available new. Most hardware can/was purchased from boltdepot, belmetric, and fastenal.

Nuts and bolts

Fan housing
- 6mmx20mm 1.25 @8 pan Phillips
- 8mmx16mm 1.25 @1 hex tap
- 8mmx45mm 1.25 @2 hex tap
- 8mmx45mm 1.25 @1 hex
- 8mmx30mm 1.25 @3 hex tap
Cooling tin
- 6mmx12mm 1.0 @1 hex tap (fastenal # 0128747)
Cylinder cooling tin
- 5mmx12mm 1.0 @2 hex tap (fastenal # 1138543)
Alternator tin
- 6mmx30mm 1.0 @1 hex tap (fastenal # 0153965)


Interesting. All my tin screws on both engines that I have are slotted cheese heads (M6x10) and the non-hex screws on the fan housing are also slotted cheese heads. I was going to change them out because I hate slotted fasteners but the list above said they should be Phillips and hex respectively. Is that what you guys have been seeing on other Type 4 engines?

Cheers
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busdaddy
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PostPosted: Mon Jun 14, 2021 2:31 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

Slot changed to Phillips ~76 IIRC, earlier ones are all slot and some hex all over the tin.
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PostPosted: Mon Jun 14, 2021 8:15 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

next time my engine is out I will replace all the fan housing hardware with some socket head screws. Mostly for cosmetic reasons, but they easier to get a proper torque on.

while i am at it, I might cut off that little flat area that sticks out just above the alternator. It gets in the way when trying to turn the engine over using a wrench on the alternator pulley.
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PostPosted: Mon Jun 14, 2021 8:48 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

obieoberstar wrote:
while i am at it, I might cut off that little flat area that sticks out just above the alternator..

Isn't that going to make belt adjustment (more) challenging?
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obieoberstar
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PostPosted: Mon Jun 14, 2021 9:08 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

never used that spot to adjust the belt.

i use a serpentine belt tool that has a 90 degree hook on the end of it to pull on the upper socket head screw to tension the belt.
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Wildthings
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PostPosted: Tue Jun 15, 2021 1:48 am    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

I like flange head screws with a hex for holding the tin as it makes removal easier. I like to use my tiny little 1/4" ratchet for installing as it keeps me from being prone to overtightening them.
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PostPosted: Tue Jun 15, 2021 8:36 am    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

busdaddy wrote:
obieoberstar wrote:
while i am at it, I might cut off that little flat area that sticks out just above the alternator..

Isn't that going to make belt adjustment (more) challenging?


Can't you just stab a screwdriver into the tin and bend it all to shit instead?

+1 for flanged or Phillips tin screws, MUCH easier to instal than flat-head when working upside down or horizontally.

Robbie
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Wildthings
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PostPosted: Tue Jun 15, 2021 9:27 am    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

airschooled wrote:
busdaddy wrote:
obieoberstar wrote:
while i am at it, I might cut off that little flat area that sticks out just above the alternator..

Isn't that going to make belt adjustment (more) challenging?


Can't you just stab a screwdriver into the tin and bend it all to shit instead?

+1 for flanged or Phillips tin screws, MUCH easier to instal than flat-head when working upside down or horizontally.

Robbie


An impact hammer is easier to use with a Phillips head as well, as it's hard to keep a bit centered in a slotted head screw.
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edhnb
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PostPosted: Wed Mar 20, 2024 2:23 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

When assembling the 2 halves of the fan shroud, is there a need for any form a gasket type sealant? Also, anyone know the torque specs for the shroud fastening bolts?
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busdaddy
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PostPosted: Wed Mar 20, 2024 3:19 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

No sealant required, but some Neverseez on the fastener threads isn't a bad idea.
Torque specs are in the Bentley, maybe not for those particular bolts, but find 2 or 3 other 6mm bolts or machine screws and see what's recommended for them, preferrably ones used in magnesium or aluminum castings.

Hint: there's some similar fasteners securing the throwout bearing guide sleeve to the bellhousing on 71+ transmissions so look in the end of the transmission section. Wink
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obieoberstar
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PostPosted: Wed Mar 20, 2024 7:46 pm    Post subject: Re: Type 4 fan shroud fasteners Reply with quote

for the 6mm screws I would not go past 80 in/lbs. 8mm, 10 ft/bs, max.

just make sure the halves are coming together evenly. they need to be snug, and just a little more.

best practice would be to run a tap/thread chaser on all the threaded fittings while you have it apart.

some Blue thread locker would be good too.
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