Dirty dirty curse words. Water pump, and tvis woes.

Franken_Hachi
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Dirty dirty curse words. Water pump, and tvis woes.

Postby Franken_Hachi » Tue Mar 12, 2019 6:51 am

Yesterday I installed a new timing belt and water pump. When I put it back together the pulley was hitting the timing belt cover, I guess the company sent me the wrong pump (shorter nose). Resting at the bottom of the timing belt cover was a bolt and that perfectly explains why only one edge of the belt was shredded. I also unhooked the tvis actuator and it acted exactly the same. I guess I'm going to be hunting for a good used tvis plate
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Image
1985 Corolla GT-S
2007 Camry (daily)
1994 Jeep Wrangler (lifted and stuff)
MECP Certified Installer
Insta: @franken_hachi

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jondee86
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Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby jondee86 » Tue Mar 12, 2019 1:03 pm

From what I have seen the RWD pump has studs with nuts to hold the fan on
and the FWD pump has threaded holes and small bolts.

Check that all the vacuum hoses associated with the TVIS solenoid/servo/
reservoir can are good. A split or disconected hose will stop the TVIS operating.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

UNLIMITED 86
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Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby UNLIMITED 86 » Wed Mar 13, 2019 5:10 am

Sounds like you're using a FWD pump with a RWD water pump pulley.

NOTE: DO NOT use the mechanical fan with a FWD pump unless you feel like being stranded!

RWD water pumps were designed to support the original mechanical cooling fan so they have a larger bearing, which makes them slightly longer than FWD water pumps. This means the FWD and RWD water pump pulleys are also slighly different (offset from pulley flange).

If you use the FWD pump (shorter pump) with a RWD pulley (more offset) it will cause interference with the timing belt cover.

If you are still using the mechanical cooling fan, you have 2 options:

1) upgrade to an electric cooling fan and find a FWD water pump pulley

2) replace the FWD water pump with a RWD water pump & send it

How did you test the TVIS? Just because nothing changed after disconnecting the actuator doesn't necessarily mean theres an issue...
IG: unltd_86

Parts for Sale: https://offerup.co/profile/ae86

WTB: OEM Windshield, hatchback 3rd brake light, and a clean Kouki Trueno Front bumper (also willing to trade mine + cash/???)

Franken_Hachi
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Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby Franken_Hachi » Thu Mar 14, 2019 8:18 am

I pulled the vacuum hose and tested the vsv valve. It wasn't holding pressure at all and I hooked the diaphragm directly to a vacuum source and it worked properly. I also tested the vsv plug for power and made sure it was getting voltage at the proper times.
1985 Corolla GT-S
2007 Camry (daily)
1994 Jeep Wrangler (lifted and stuff)
MECP Certified Installer
Insta: @franken_hachi

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jondee86
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Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby jondee86 » Thu Mar 14, 2019 2:14 pm

VSV works like this....

Image

When the VSV is not energised the valve moves to the left and port F is
closed trapping vacuum in the vacuum tank. The actuator port E is connected
to atmosphere thru the filter. The TVIS is open.

When the VSV is energised by the ECU the valve moves to the right and ports F
and E are connected (vent to atmosphere closed) to allow vacuum from the vacuum
tank/manifold to reach the actuator. The TVIS is closed.

If everything is working properly, when you go to start the engine the TVIS will close
immediately using vacuum from the tank, and stay open using manifold vacuum once
the engine is running. At approximately 4200rpm the ECU will de-energise the VSV
closing off the vacuum source allowing the actuator to open the TVIS plates.

So if you test the VSV off the car without voltage applied, port F will hold vacuum and
port E won't.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

UNLIMITED 86
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Posts: 128
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Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby UNLIMITED 86 » Thu Mar 14, 2019 11:42 pm

The VSV should NOT hold pressure but should hold vacuum (either port).

I suggest making sure the VSV filter isn't obstructed, the acummulator tank isnt damaged (holds vacuum), and inspect all the vacuum lines to/from make sure they are secured properly (fit snug, not loose).
IG: unltd_86

Parts for Sale: https://offerup.co/profile/ae86

WTB: OEM Windshield, hatchback 3rd brake light, and a clean Kouki Trueno Front bumper (also willing to trade mine + cash/???)

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jondee86
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Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby jondee86 » Fri Mar 15, 2019 3:02 am

UNLIMITED 86 wrote:The VSV should NOT hold pressure but should hold vacuum (either port).

Image

Image

Port E (actuator) is never actually sealed. It is either open to atmosphere
or connected to port F. Port E will only hold vacuum if you block port F and
the solenoid is energised.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

UNLIMITED 86
Club4AG Enthusiast
Posts: 128
Joined: Mon Jan 14, 2013 10:38 pm
Location: 619

Re: Dirty dirty curse words. Water pump, and tvis woes.

Postby UNLIMITED 86 » Fri Mar 15, 2019 9:59 pm

jondee86 wrote:
UNLIMITED 86 wrote:The VSV should NOT hold pressure but should hold vacuum (either port).

Image

Image

Port E (actuator) is never actually sealed. It is either open to atmosphere
or connected to port F. Port E will only hold vacuum if you block port F and
the solenoid is energised.

Cheers... jondee86


Jondee, thanks for the correction.

It was late last night and all i had for reference was the section view of the VSV that you provided, so I overlooked the fact that the shuttle closes Port E's flow path to the VSV filter when power is applied.

Sorry for any confusion this may have caused.
IG: unltd_86

Parts for Sale: https://offerup.co/profile/ae86

WTB: OEM Windshield, hatchback 3rd brake light, and a clean Kouki Trueno Front bumper (also willing to trade mine + cash/???)

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