Inspection Of Bvsv

CHECK BVSV BY BLOWING AIR INTO PIPE

(a) Drain the coolant from the radiator into a suitable container.

(b) Remove the BVSV.

(c) Cool the BVSV to below 35°C (95°F> with cool water, id) Blow air into a pipe and check that the BVSV is closed.

(e) Heat the BVSV to above 54°C (129°F) with hot water.

<f) Blow air into a pipe and check that the BVSV is open. If a problem is found, replace the BVSV.

(g) Apply sealant to the threads of the BVSV and reinstall.

Sealant: Part No.08833-00070. THREE BOND 1324 or equivalent

(h) Fill the radiator with coolant.

Closed

Cool Water

Closed

Cool Water rcoc«*

Open Hot Water icoow

Open Hot Water

DASH POT (DP) SYSTEM

Toyota Supra Dash PotToyota Corolla Bvsv
Air Filter

tC)3i;CC33I8

7M-GE 7M-GTE

OP Diaphragm

Air Filter tC)3i;CC33I8

Normal Driving

DP Diaphragm

CC3439

To reduce HC and Co emissions, when decelerating the dash pot opens the throttle valve slightly more than at idle. This causes the air-fuel mixture to burn completely.

Condition

Diaphragm

VTV

Throttle Valve

Idling

Pushed in by return force of throttle valve

CLOSED

Idle speed position

Normal driving

Pushed out by diaphragm spring

OPEN

High speed position

Deceleration

Pushed m by return force of throttle valve

CLOSED

Slightly opens and then slowly closes to idle position

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  • Alisha
    How to remove bvsv valve?
    8 years ago

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