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Just. 2002 forester. Just did the heads. Sudden engine

Customer Question
2002 forester. Just...

2002 forester. Just did the heads. Sudden engine clatter with right cam sprocket failure. Ideas?

Mechanic's Assistant: How many miles are on the car? Is it an automatic or a manual transmission?

R180k. Manual trans.

Mechanic's Assistant: Are you fixing your Forester yourself? What have you tried so far?

Installed new sprocket. Reinstalling the new timing belt. Of course the engine quit when the belt cam of.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Started clattering for 1 mile before faiure. Oil good. Just had heads repaired including seals and guides.

Submitted: 2 months ago.Category: Subaru
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Answered in 7 minutes by:
12/24/2017
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago
David Craig
David Craig, Auto Mechanic
Category: Subaru
Satisfied Customers: 4,757
Experience: Owner/Mechanic at 3D Automotive
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Hi my name is ***** ***** I'll be more than happy to assist you, Please allow me a few minutes to review your information. Thank you.

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Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

the cam sprocket failed and the clatter happened after you did the heads?

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Customer reply replied 2 months ago
2002 2.5lt soc ej25
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

the cam sprocket failed and the clatter happened after you did the heads?

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Customer reply replied 2 months ago
after head repair. 2 tanks of gas on repaired heads. Included heating surfacing seals guides.
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

ok well if its a sohc then you shouldn't have did any damage to the valves, at what point are you in the process? What do you have taken apart so far?

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Customer reply replied 2 months ago
I have only replaced cam sprocket and starting reinstall the belt.
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

its a non interference engine so you should be good. im wondering why it failed unless the tensioner failed.

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Customer reply replied 2 months ago
Also adjusted valves on head installation to spec. Oil level good. Pressure good
Sprocket failure buggered the end of the keyway on the cam shaft
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

oh, I have seen that happen.... the key way stripped or wallowed out

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Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

you got lucky with it being non interference

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Customer reply replied 2 months ago
Wallowed out. Funny. Everywhere i looks says ej25 is an interfernce engine. Non interference would be good.
Customer reply replied 2 months ago
The short button on the sprockey wided the of the keyway. The old sprocket separated. Was running like new. Tensioner is very has pressure. Difficult to colapse. As in pressure
Springs when pull the pin
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

new tensioner? if not i would think about replacing it

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Customer reply replied 2 months ago
I haven't replaced it. I bought at 167k now 180k. I replaced belt when i changed the pump. I don't know the history. What do you think caused the clatter before the sprocket failure. If it was an interference motor i would of suspected a stuck valve.
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

i really want to say possible oil seepage from the tensioner is what i have seen most

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Customer reply replied 2 months ago
Would the tensioner cause the clanking? And what force caused the sprocket to break with such force it it screwd the keyway?
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

if a tensioner fails its not holding pressure on the belt

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Customer reply replied 2 months ago
If the it slips. It doesn't seem there would be enough tension to shatter the cam sprocket. The inner sprocket stopped and the out kept turning. You don't think it is stuck valve? Was loud. My plan is a new tensioner and and reassemble.
I just lut the heads back on. Was runny like new
Subaru Mechanic: David Craig, Auto Mechanic replied 2 months ago

ok, Im going to open this up to the other to chime in.

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Subaru Mechanic: tamaz, Subaru master technician replied 2 months ago
tamaz
tamaz, Subaru master technician
Category: Subaru
Satisfied Customers: 1,311
Experience: Subaru certified,ASE Master technician,25 years experience
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Hi,this is a interference engine ,is it possible cam seized?

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Customer reply replied 2 months ago
I'm hoping it didn't seize. I can turn it easily with a rachet for timing. I put the new sprocket on it started no noise but it was not running well. I may have been a cog off u5on the belt though.
Subaru Mechanic: tamaz, Subaru master technician replied 2 months ago

Compression test done yet?

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Customer reply replied 2 months ago
That's next in the am.
Subaru Mechanic: tamaz, Subaru master technician replied 2 months ago

Let me know,I'm betting we bent some valves but I hope I'm wrong

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Customer reply replied 2 months ago
That's what I'm afraid of. Kust refurbished the heads less than 2 tanks ago.
Seats were ground. Think i could replace valves seals and guides without maching?
Subaru Mechanic: tamaz, Subaru master technician replied 2 months ago

Sure, guides shouldn't be necessary

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Customer reply replied 2 months ago
Yeah I'm think max 2 intake valves. I just saw a youtube and my clatter resembles
tensioner. Thinking the belt loosened and put slight outward tension on cam sprocket causing sprocket failure. Despite the clatter the engine ran well until the sprocket failed and the belt came off. My only other issue is the sprocket tore the end of the cam keyway. Y out at the end. The button on the new sprocket seems to engage tightly for timing
Subaru Mechanic: Cary York,
 replied 2 months ago
Cary York
Category: Subaru
Satisfied Customers: 436
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Phone call session started
Subaru Mechanic: Gary, ASE Certified Technician replied 2 months ago
Gary
Gary, ASE Certified Technician
Category: Subaru
Satisfied Customers: 1,510
Experience: Senior Technician
Verified

Hello there,

Sounds like the cam gear bolts were loose.

That's the only way a gear keyway fails.

Gary

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