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Old 09-13-2019, 07:22 PM   #1
lummert
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Default B230FT timing belt guide washers

While checking timing marks for the timing belt on my 88 765 with B230FT I noticed that the notch on the front belt guide washer doesn't align with the key way on the crank. Is this an indicator of the crank sprocket having slipped on the crank throwing off cam timing?

Yes, I was replacing the timing belt on my B230FT which has no belt covers. So I was replacing the belt without removing the crank pulley. My car threw the timing belt last night while driving during a hard rain. The belt was also walking back and forth on the cam sprocket the past few days.
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Last edited by lummert; 09-13-2019 at 07:28 PM..
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Old 09-13-2019, 07:27 PM   #2
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The notch isn't supposed to line up with the keyway, the slot does however. The notch points to where the timing mark is located on the timing cover
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Old 09-13-2019, 07:33 PM   #3
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Quote:
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The notch isn't supposed to line up with the keyway, the slot does however. The notch points to where the timing mark is located on the timing cover
This is how I have the belt installed (outer notch on washer aligned with the front timing cover timing mark) even though that isn't how the timing belt pictures show its supposed to be. Car runs like somethings not timed properly.

There are no plastic belt covers in place. Cam sprocket dimple is aligned with the oil fill cap, with number one cam lobes pointing up.
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Old 09-13-2019, 07:37 PM   #4
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Yeah, it sounds like something slipped. The TDC notch on the outer washer should line up with the locating groove in the crank.



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Old 09-13-2019, 08:08 PM   #5
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Okay, i went out to my car with the flashlight when it's nearly dark out. What I though was a crank key way may be the cut place in the rear of the crank pulley that aligns with the nub on the crank sprocket. So after looking at the valve cover i may have the cam sprocket out of time by 1 tooth.
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Old 09-13-2019, 08:12 PM   #6
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Quote:
Originally Posted by hiperfauto View Post
Yeah, it sounds like something slipped. The TDC notch on the outer washer should line up with the locating groove in the crank.



So could the crank sprocket locating tab break off at the crank key way as opposed to the sprocket nub breaking of at the crank pulley?

If it's just the nub for the crank pulley I may be able to figure out where the timing mark should be until I have time to locate my spare crank sprocket.

Last edited by lummert; 09-13-2019 at 08:19 PM..
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Old 09-13-2019, 08:18 PM   #7
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Old 09-14-2019, 01:10 PM   #8
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Update:

Found that there was nothing amiss with the timing marks. The problem turned out to be fuel rated.

I had recently switched from a BMW 320i ECT back to the OE type ECT for LH 2.2. Then there seemed to be too much fuel so I swapped to the BMW 2.5 Bar fuel pressure regulator.

Yesterday I found that the harness to the ECT was just hanging loose with the connector of the ECT still attached. I then swapped back to the BMW 320i ECT that I just happened to have in my car.

Today I swapped from the BMW 320i FPR back to the 89 Firebird Turbo 3.8 V6 3 Bar FPR. The idle improved without needing to adjust the AMM pot set screw.

So I had gone from too much fuel due a broken ECT to too little fuel due to fuel pressure being too low.

BMW 320i ECT has the white connector which just so happened to have been used by Volvo on earlier cars with Motronic.

The Bosch 3.0 Bar FPR is meant for an 89 Firebird with Turbo 3.8 V6. This FPR is direct fit to the B230 fuel rail but due the the return line requires an adapter to accept the return hose.

So now running the 320i ECT and the Firebird FPR with the white composite body injectors (0 280 155 811) from Supercharged Buick 3800 V6.
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