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Guest Message by DevFuse

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EJ25 cam swap question - swap cam or retain cam with head?

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3 replies to this topic

#1 idosubaru


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Posted 07 November 2011 - 03:16 AM

i'm getting used SOHC heads for a friends 03 forester that busted a timing belt.

1. the replacement heads are off an engine with rod knock - which suggests previous overheating and these do sometimes seize cams.
- cam seizure is related to bearing surface on the head or cam?

2. the original engine has never been overheated.

is it better to:

1. swap the original cams into the replacement heads?
2. keep the cams married to the heads they're in?

done lots of EJ swaps, head jobs...but never thought about this...

#2 MilesFox


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Posted 07 November 2011 - 09:06 AM

I would suppose keep the cams together. Minly, because you can remove and install the heads without removing the cams.

This is a relief to anyone who has done millions of ea82's!

I doubt the cams would be affected as much from overheats, being they are farthest from the source of heat, and are made of harder metals.

#3 davebugs


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Posted 07 November 2011 - 09:25 AM

I'd inspect (mostly looking for bad burnt oil evidence) and then leave the cams inplace. They are matted/worn in by this time and match the head.

And as pointed out are easy enough on a SOHC to change later if necessary.

Now if its ugly under that valve cover I might rethink it.

#4 idosubaru


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Posted 07 November 2011 - 10:19 AM

that's tough, i hear you. it's just hard removing the known good, never overheated parts when i have seen cam seizures.

i'll probably keep them with the head, but save the original cams just in case.

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