Head Rebuilding

A1ex · Post by **A1ex** » Tue Mar 17, 2015 2:16 pm

NafemanNathan wrote:That is quite a lot of wear on the cams. Do you know what the mileage is?

circa 125k

wurlycorner wrote:That's with the cams fresh out of the head right? (not cleaned up at all)

It sure is

I'm wondering if it's getting the micrometers out to measure the lobe height to see if much has worn off. There is some slight wear on the rocker arms too.

Vtecmec wrote:It's worth getting it skimmed for piece of mind (cost me £25). It'll cost you more than that to buy a precision straight edge to check it!

If it's that much I may as well, thanks

Post by **Vtecmec** » Tue Mar 17, 2015 2:37 pm

Here's how my cams looked coming from a really dirty engine.

A1ex · Post by **A1ex** » Tue Mar 17, 2015 2:40 pm

wow! There's a difference.

Looks like new cams could be on the cards then

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Tue Mar 17, 2015 2:49 pm

Get them cleaned up, re-inspect and then measure them first.
Like I say, yours are extremely dirty at the moment. I would guess at some point in its history, it has gone a long, long time between oil changes to get them that dirty. They might be worn, but the severe blackness of the rest of the cam exacerbates how the wear looks at the moment.

A1ex · Post by **A1ex** » Thu Apr 23, 2015 9:46 pm

I think I know why my exhaust cam was so worn;

When lapping the valves I noticed some drag pushing the exhaust valves the last cm or so. I think the stem seals have given up and the oil has burnt onto the valve stem causing extra drag on the exhaust valves and wearing the cams. The inlet valves slid in with no drag at all.

Does that sound plausible?

Post by **Drax** » Thu Apr 23, 2015 11:29 pm

A1ex wrote:wow! There's a difference.

Looks like new cams could be on the cards then

you should replace them with....

.....

Post by **Lude-dude** » Fri Apr 24, 2015 10:22 am

I have complete head minus rocker cover free to collect

if you want a cheap fix or any bits