|
#1
|
|||
|
|||
Opinions - scrap cylinder head?
Hi all,
Dismantled some of my engine's valve assemblies last night, and it looks like the valve guides have had a rough time - all four I checked have been broken! In my opinion this is damage that can't be repaired (unless someone knows how to remove & replace the guide inserts) and so I should scrap the cylinder head. The other question is - how badly was the engine treated to allow this to happen to at least four valves? However I'm an engine novice, so I thought I'd ask you loverly fellas what you think. Is it usable/fixable, or shall I use it to make a special ornamental table like they have on Top Gear? Cheers, Mike |
#2
|
||||
|
||||
Yeah, if it's something like a 1.8 CVH head then bin it. If it's a 1930's Lagonda head then fix it.
TT
__________________
You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#3
|
||||
|
||||
The photo is a little fuzzy & gives very little clue as to what engine the head is off
It has been my experience that this type of damage is typical of a cam belt failure at some point in it's life Sometimes when a cam belt fails, you'll be lucky & only bend a few valves .... Other times it will destroy some casting around the guides and FUBAR some of the piston crowns !!?? At the end of the day, unless it is somthing realy exotic or rare, it'll be way more ecconomical to replace the head .
__________________
I am not a complete idiot...........Some of the parts are missing !! Ronnie www.roadster-builders.co.uk |
#4
|
||||
|
||||
From his other posts, I think He has a Twincam. They are not known for chain failures, but if it did then it would do a lot of damage..
TT
__________________
You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#5
|
||||
|
||||
hi, its no major problem to fit new valve guides just press out the old ones press in new ones and lightly recut valve seats if you cant diy then ask your local engine reconditioners for a price.
What engine is it? Ray |
#6
|
|||
|
|||
Hiya, thanks for the posts - and sorry I should have mentioned what engine it was! It's an I4 DOHC jobby out of my donor Sierra.
And yes, I know it's a crap engine, but it was cheap to get! You've all made a lot of interesting points relating to timing chain failure. The chain tensioner often gets mentioned as a weak point in this engine, if this did slip the chain then maybe what I'm looking at is a cheap bodge job to get the engine working again. The valve guide damage isn't the only bad bit about the cylinder head - there's several other faults such as bearing surface scoring, bruising to the head surface..... . I think the best option is to scrap at least the cylinder head. Last time I was down at the local scrapyard (G&W Bridges on the M23) there were plenty of I4s available to scavenge - should be able to pick up a better one for little cost. Or maybe source a Zetec instead RAYLEE, thanks for your comment about pressing in new valve guides - I would have taken that option if there weren't other problems with the head. In the meantime I'll finish cleaning the cylinder head and get to work on an ornamental glass table. |
Thread Tools | |
Display Modes | |
|
|