2001 S40 Turbo engine starts but Exhaust cam lose timing

Chiroodza · Post by **Chiroodza** » 28 Jan 2019, 23:00

Good day

We recently had an engine overhaul on 2001 S40 due to mixing oil and water. So the head was skimmed, valves tested, crankshaft polished, installed new piston rings, bearings, head gasket, timing belt and new oil seals. We had some challenges first on timing but then finally got it using the cam locking tool. The problem now is the engine starts within three seconds, runs for 1-3 seconds and then cut off. when you turn the key again it just cranks but no start. after trouble shooting i noticed the exhaust is out of time by 1 or 2 gears up.

Post by **RickHaleParker** » 29 Jan 2019, 05:26

Variable Valve Timing (VVT), accomplished by changing the relationship of the timing gear pulley to the camshaft. That is what the hub inside of the timing gear pulley is for.

Then you installed the timing gear pulley did you do the pre-alignment procedure before you installed the timing belt?

After changing the timing belt on my 2003 S40. I had to disconnect the camshaft position sensor and let it fire up and run from the lookup tables before it would fire up and run with the camshaft position sensor connected.

You can disconnect the camshaft position sensor at the harness gang located under the plastic cover that runs across the top of the firewall. It did take a lot of cranking to get it fired up and running the first time.

Chiroodza · Post by **Chiroodza** » 29 Jan 2019, 05:52

Yes the pre-alignment was done but i now suspect that "maybe' not enough torque was applied to lock the VVT pulley. I will make sure its tightened and try your suggestion as well.

Chiroodza · Post by **Chiroodza** » 29 Jan 2019, 06:14

I downloaded and followed this video on youtube CChange_timing_belt_Volvo_S40_T4_distribución__mediumhange_timing_belt_Volvo_S40_T4_distribución__medium

Post by **alschnertz** » 29 Jan 2019, 14:25

Chiroodza wrote: ↑29 Jan 2019, 05:52 Yes the pre-alignment was done but i now suspect that "maybe' not enough torque was applied to lock the VVT pulley. I will make sure its tightened and try your suggestion as well.

This is what I was going to recommend you check when I read your first post.
My Haynes manual says the center VVT pulley belt retaining bolt requires 66 ft-lbs (90 n-m) of torque.
I know I used 66 ft-lbs when I reinstalled mine, and it has never slipped.

It's good that you used the cam locking tool. There is no other way to set the cams without it.

Chiroodza · Post by **Chiroodza** » 30 Jan 2019, 23:20

Thank you very much for the recommendation. I used a torque of 90nm on the VVT pulley and the engine starts with one kick without slipping. The new problem is oil leaking on inlet cam shaft which i suspect the seal could have been damaged i will be looking into that today. Thank you very much

Post by **alschnertz** » 31 Jan 2019, 14:14

You say it has an intake camshaft seal leak.
Be sure to carefully diagnosis this as the source.

There have been MANY mis-diagnosed camshaft seal leaks that have turned out to be a failed VVT sprocket instead.

I am included as one who made one of those mis-diagnosisies.

Chiroodza · Post by **Chiroodza** » 01 Feb 2019, 01:13

You are right, i managed to change the cam seal and the leak stopped on that point. i had a test drive today but after about 40miles there was no rave but the engine and fan were still running. So switched the engine off and tried to start it without luck. I then noticed oil over the cam cover and the plugs were soked with oil from the top. So i changed the plugs and it kicked but have no idea yet were the oil came from. the oil cap had no sign of leak. Am at work now and suspect a crack somewhere and high probability of mis-diagnosis.

Post by **alschnertz** » 01 Feb 2019, 03:24

In addition to checking the VVT sprocket for leaks, You should also check the VVT solenoid for leaks.
I haven't experienced a solenoid leak yet on my 230,000 mile '01, but have read of their failures as well.

AmericanT4 · Post by **AmericanT4** » 03 Nov 2019, 19:59

A common problem with these cars is the oil cooler fails and mixes oil with the coolant and have seen this misdiagnosed as head gasket failure. The oil seals on the oil cap are also know to fail and flood the plugs with oil i would check for cracked oil seal on cap and vvt sylinoid